BS 410

BRITISH STANDARD

BS 410:1986 Incorporating Amendment No. 1

I S B ) c ( , y p o C d e l l o r t n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N i r F , i t c u r t s n o C g n i r e e n i g n E i a d n u y H , e e L u S g n o D : y p o C d e s n e c i L

Specification for

Test sieves

UDC 621.928.2:620.168.32 621.928.2:620.168.32

BS 410: 410:19 1986 86

I S B ) c ( , y p o C d e l l o r t n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N i r F , i t c u r t s n o C g n i r e e n This British Standard, having i g been prepared under the n direction of the General General E direction i Mechanical Engineering a Standards Committee, was d published under the authority n u of the Board of BSI BSI and comes y into into effect effect on H 31 Marc March h 1986 1986 , e e L © BSI 01-1999 u S First published April 1931 g First revision October 1943 n Second revision December 1962 o Third revision September 1969 D : Fourth revision September 1976 y Fifth revision March 1986 p o C d The following BSI references e relate to the work on this s standard: n e Committee reference GME/29 c Draft for comment 84/79133 DC i L ISBN 0 580 14897 1

Committees responsible for this British Standard The preparation of this British Standard was entrusted by the General Mechanical Engineering Standards Committee (GME/-) to Technical Committee GME/29, upon which the following bodies were represented: BCIRA British Aggregate Construction Materials Industries British Ceramic Society British Laboratory Ware Association Cement and Concrete Association Cement Makers’ Federation Coated Abrasives Manufacturers Association Department of Trade and Industry (Warren ( Warren Spring Laboratory) Department of Transport (Highways) Guild of Metal Perforators Incorporated National Association of British and Irish Millers Institution of Chemical Engineers Institution of Mining and Metallurgy Mechanical Handling Engineers Association Ministry of Defence National Coal Board Society of Chemical Industry Society of Cosmetic Scientists Woven Wire Association The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Institution of Mining Engineers Oil and Colour Chemists Association University of Bradford

Amendments issued since publication publication Amd. No.

Date of issue

Comments

82 5 5

July 1994

Indicated by a sideline in the margin

BS 410:1 410:198 986 6

Contents


Committees responsible Foreword 1 2 3 4 5

Page Inside front cover ii

Scope Definitions Sieve designation, construction and marking Woven wire cloth in test sieves Perforated plates in test sieves

1 1 2 2 5

Appendix A Information to be supplied with with an enquiry and order Appendix B Sieving areas and aperture tolerances tolerances expressed as percentages Appendix C Inspection of woven wire cloth Appendix D Inspection of perforated plate plate Appendix E Mesh number Appendix F Calibration tests Appendix G Maintenance of test sieves Appendix H Used sieves

10 12 13 14 15 16 16

Figure 1 — Weaves of wire cloth Figure 2 — Lid and receiver for round test sieves Figure 3 — Specimen label Figure 4 — Measurement of woven wire aperture size Figure 5 — Arrangement of square holes Figure 6 — Arrangement of round holes Figure 7 — To Tolerance ba band ga gauge fo for op optically ma magnified si sieve cl cloth Figure 8 — Re Record card for for insp nspection of of wo woven wi wire cl cloth te test si sieve Figure 9 — Record card for inspection of of perforated plate test sieve Figure 10 — Fields of measurement in 200 mm round test sieve

2 3 4 4 6 6 12 13 14 15

Table 1 — Dimensions of round test sieve frames Table 2 — Wire cloth in test sieves: wire diameter and tolerances on apertures Table 3 — Perforated plate in test sieves: plate thickness, pitch of hole holes, s, minim inimum um brid bridg ge wid widtth and and tole tolerranc ance on on ind indiv ivid idua uall ap apertu erture ress Table 4 — Sieving areas and aperture tolerances expressed as percentages Table 5 — Mesh number Table 6 — Number of of apertures to be measured measured in a 200 mm diameter test sieve Publications referred to

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3 5 8 10 14 15

Inside back cover

i

BS 410: 410:19 1986 86

Foreword


This British Standard, having been prepared under the direction of the General Mechanical Engineering Standards Standards Committee, supersedes BS 410:1976 which is withdrawn. For wire cloth test sieves the R 40/3 series of aperture sizes, where successive sizes have a ratio of about 1.2, are specified. For perforated plate test sieves both the R 40/3 and the R 20 series are specified particularly to meet the requirements of the aggregate, coal and iron industries. A few special non- ISO1) aperture size perforated plate test sieves, some of such long standing that they have to be retained and others of larger size than is required by ISO/TC 24, are also included [see [see Table Table 3 c)]. c)]. Mesh numbers are included in Appendix E. A specification for electroformed test sieves is being developed developed by ISO/TC ISO/TC 24 and the “nominal size of openings” is specified in ISO 565-1983. A British Standard specification for electroformed sheet test sieves is in preparation. The methods of use of test sieves are described described in BS 1796. In Figure 3 and Figure 7 the term “micron” is used as this is widely accepted in industry as representing micrometre (µm). This revised standard now includes an additional aperture size, 32 µm, and requirements for nesting round test sieves. A British Standard does not purport purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages pages 1 to 16, an inside inside back back cover and and a back cover. cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front front cover. cover.

1)

ii

International Organization for Standardization.

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BS 410:1 410:198 986 6


1 Scope This British Standard specifies requirements for sieves used for testing the size distribution of granular products in the particle size range from from 125 125 mm down down to 32 µm. µm. Appendix G gives information on the maintenance of test sieves. NOTE The titles titles of the the publication publicationss referred referred to in this standar standard d are listed on the inside back cover.

2 Definitions For the purposes of this British Standard the following definitions apply2). 2.1 test sieve a sieve, intended for the particle size analysis of the material to be sieved, which conforms to a test sieve standard specification 2.2 nest of test sieves a set (regular or irregular) of test sieves assembled together with a lid (cover) and receiver (pan)

2.9 wire diameter the diameter of the wire in the woven cloth 2.10 warp all wires running lengthwise of the cloth as woven 2.11 weft (shoot) all wires running crosswise of the cloth as woven 2.12 type of weave the way in which warp and weft wires cross each other 2.13 plain weave the weave in which every warp wire crosses alternately above and below every weft wire and vice versa versa [see Figure Figure 1 a)] 2.14 twilled weave

2.3 sieving medium

The weave in which every warp wire crosses alternately above and below every second weft wire and vice versa versa [see Figure Figure 1 b)]

a surface containing regularly arranged apertures of uniform shape and size

2.15 perforated plate

2.4 frame

a sieving medium consisting of a plate with uniform holes in symmetrical arrangement

a rigid framework which supports the sieving medium and limits the spread of the material being sieved

2.16 pitch (centres)

2.5 lid (cover) a cover which fits snugly over a sieve to prevent escape of the material being sieved 2.6 receiver (pan) a pan which fits snugly beneath a sieve to receive the whole of the passing fraction 2.7 aperture size the dimension defining an opening 2.8 woven wire cloth

the distance between corresponding points of two adjacent holes in a perforated plate 2.17 bridge width (bar) the distance between the nearest edges of two adjacent holes in a perforated plate 2.18 margin the distance between the outside edges of the outside rows of holes and the edges of a perforated plate 2.19 plate thickness the thickness of the plate after perforation

a sieving medium of wires which cross each other to form the apertures

2) Taken

from ISO 2395.

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BS 410: 410:19 1986 86

I S B ) c ( , The seal between frame and sieving medium shall y p be formed so as to prevent lodging of the material to o C be sieved. There shall be no lacquer on surfaces that d come into contact with the sample. e l l 3.5 Nesting o r t n Sieves to the dimensions in Table 1, complete with o lid and receiver, in a nest, shall so assemble that c n escape of sample during the test sieving operations U , is prevented. 7 0 3.6 Marking 0 2 A label shall be permanently attached to the frame frame 0 of each sieve complying with this standard, legibly 0 : 0 marked with the following information 0 (see (see Figure Figure 3). 3). + T a) The designation. The figures shall be bold, and M preferably not less than 5 mm tall, on the left left side G of the label. 7 5 : b) The wording “TEST SIEVE TO BS 410:1986”3). 1 2 : c) The material of the wire cloth or of the 5 0 perforated plate. 2 d) The material of the sieve frame. 0 v e) The maker’s name or trade mark. o Figure 1 — Weaves of wire cloth N f) An identification number. i r g) If required, the wire diameter. F , 3 Sieve designation, construction and i t NOTE The purchaser purchaser should state in the the enquiry enquiry and order c marking (see Appendix A) if this marking is required. u r t s 3.1 Designation 4 Woven wire cloth in test sieves n Test sieves shall be designated by the nominal o 4.1 Material C aperture size, which is the nominal central g separation of opposite sides of a square aperture or Wires in test sieves shall not be plated. n i r the nominal diameter of a round (circular) aperture. NOTE 1 The materia materiall for woven woven wire wire cloth cloth is not specified specified.. e e The type of hole, square or round, in perforated The following materials are commonly supplied. n plate shall be stated. i Material Range of aperture size for which g n 3.2 Sieve frames suitable E Phosphor bronze Less than 250 µm i The dimensions of round sieve frames shall be as a Brass 250 µm to 166 mm d given in Table 1. n S t a i n l e s s s t e e l All sizes u NOTE 1 Frames should be made made of brass, brass, plated steel or or y NOTE 2 The purchase purchaserr should should state state in the enquiry enquiry and order order H stainless steel. (see Appendix A) specific requirements, if any, for the material of appropriate ate sieving sieving medium medium is included included in Table Table 1. , NOTE 2 The appropri the wire cloth. e NOTE 3 For special special purpose purpose sieving, sieving, other other shapes shapes of frame frame are are e 4.2 Wire L available. u 3.3 Lid and receiver After the cloth is mounted mounted in the sieve, the average average S wire diameter at different positions across the g When required for round sieves, lids and receivers n sieving surface shall be uniform so that the limits on o shall be of the same metal and gauge as the sieves aperture size can be satisfied. D (see Figure 2). : y 3.4 Finish A band of choice of ± 15 % about the wire diameters diameters p given in Table 2 is permitted. o C Test sieves, receivers and lids shall be smoothly d finished. e s n 3) e Marking BS 410:1986 on or in relation to a product is a claim by the manufacturer that the product has been manufactured in c accordance with the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturer’s i L responsibility. Enquiries as to the availability of third party certification should be addressed to the appropriate certification body.

2

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BS 410:1 410:198 986 6


Table 1 — Dimensions of round test sieve frames

Nominal diameter, D and d

Tolerance

mm

1 00

d

min.

max.

Full

Half

mm

mm

mm

mm

mm

mm

+ 0 .4 + 0 .8 – 0

3 00

+ 0 .9 – 0

4 50

+ 1 .0 – 0

a When

Nominal depth, H

D

– 0 2 00

Diameter of sieving surface

– 0 .0 1

Appropriate sieving medi um

90

10 0

40

20

Wire cloth

1 85

20 0

50

25

Wire cloth or perforated plate

2 75

30 0

75

40

Wire clotha or perforated plate

4 25

45 0

Not less — than 100

Wire clotha or perforated plate

– 0.4 – 0 .0 1 – 0.4 – 0 .0 1 – 0.6 – 0 .0 1 – 1.0

fine wire cloth is used in large diameter sieves, it should be supported by means of a support mesh or spider.

Figure 2 — Lid and receiver for round test sieves

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BS 410: 410:19 1986 86

I S B ) c ( , y p o C d e l l o r t n o c n U , 7 0 Figure 3 — Specimen label 0 2 NOTE 1 Aperture Aperture toleranc tolerances, es, expressed expressed as percentag percentages, es, are are 0 4.3 Weave 0 given in Appendix B. : 0 Wire cloth shall be woven to produce nominally NOTE 2 If the purc purchas haser er requir requires es a tolera tolerance nce on 0 perpendicularity, this should be included in the order. No uniform square apertures in accordance with 4.5. 4.5 . + tolerance on perpendicularity of warp and weft wires is specified T Wire cloth in sieves with a nominal aperture size in this standard since users’ requirements may differ according M greater shall shall be plain woven. woven. to the material material to be tested. tested. A tolerance tolerance of ± 3° from G of 75 µm and greater perpendicularity may be acceptable in many cases and a visual 7 Wire cloth in sieves with a nominal aperture inspection of general appearance of perpendicularity may be 5 : smaller shall shall be either either twilled twilled or plain plain acceptable in other cases. It should be recognized that a test 1 of 63 µm and smaller 2 should apply to the general directions of the warp and weft wires woven. : over several apertures and not to a single aperture. 5 aperture sizes sizes of 4.00 mm and greater greater,, the wire 0 For aperture 4.6 Inspection 2 shall be crimped before weaving. 0 4.6.1 General. The manufacturer shall test each test v 4.4 Mounting o sieve before sale and supply a record card N The wire cloth shall be so mounted in the frame as (see Appendix Appendix C). i r to be held firmly and equally taut in all directions NOTE The purchaser purchaser should state in his order when a more F , without any distortion of the mesh. detailed test, i.e. a calibration test in accordance with i t Appendix F, is required to be made by the manufacturer. c 4.5 Tolerances on aperture size u Tests shall be made with respect to each of three r t s 4.5.1 General. The measured aperture size before X Y and Z as as listed in Table 2. n the sieve is used shall comply with the nominal size tolerances , and o 4.6.2 Survey for condition. When tested in given in Table 2. C within tolerances X , Y , and Z given C.2, the sieve shall not show any g Aperture size is measured on the centre lines of the accordance with C.2, n obvious faults, e.g. weaving defects such as loose i r aperture (see Figure 4) and the tolerances shall wire, creases and wrinkles. Part apertures are likely e apply to the warp and weft directions separately. e to be found round the periphery but if any a ny blinded n i apertures away from the periphery are found the g n sieve shall be deemed not to comply with the E i requirements of this standard. a d 4.6.3 Oversize apertures. When tested in accordance n u with C.3, C.3, no aperture shall exceed the maximum y dimension given in 4.5.2. 4.5.2. H , 4.6.4 Variations of aperture size. When tested in e e accordance with C.4 and C.4 and C.5, C.5, the proportion of L apertures exceeding the intermediate limit shall be u S Figure 4 — Measurement of woven wire not greater than that given in 4.5.4. 4.5.4. g aperture size NOT E T ol olerance + X ensures ensures that no individual aperture n o exceeds a maximum maximum limit; tolerance tolerance ± Y controls controls the average size D 4.5.2 Maximum tolerance for size of an individual of aperture; aperture; tolerance tolerance + Z ensures ensures that the measured average : y aperture. No aperture size shall exceed the nominal size of aperture is not influenced too much by apertures of p value by more than the tolerance X . extreme size. o C 4.5.3 Average aperture size. The average aperture d size shall not differ from the nominal value by more e s than the tolerance Y . n e 4.5.4 Intermediate tolerance. Not Not more more than than 6 % of c i L the apertures shall be above nominal size by more than the tolerance Z .

4

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BS 410:1 410:198 986 6


Table 2 — Wire cloth in test sieves: wire diameter and tolerances on apertures Apertures in the range 16 mm to 20 µm Nominal Nominal Tolerances aperture wire diameter Maximum Tolerance Intermediate size tolerance for tolerance in test for size of average sieve an aperture individual aperture X

Y

Z

mm

mm

mm

3 .1 5 2 .8 0 2 .5 0

+ 0 .9 9 + 0 .8 6 + 0 .7 7

± 0 .4 9 ± 0 .4 1 ± 0 .3 5

+ 0 .7 4 + 0 .6 4 + 0 .5 6

9 .5 0 8 .0 0 6 .7 0

2 .2 4 2 .0 0 1 .8 0

+ 0 .6 8 + 0 .6 0 + 0 .5 3

± 0 .3 0 ± 0 .2 5 ± 0 .2 1

+ 0 .4 9 + 0 .4 3 + 0 .3 7

5 .6 0 4 .7 5 4 .0 0

1 .6 0 1 .6 0 1 .4 0

+ 0 .4 7 + 0 .4 2 + 0 .3 7

± 0 .1 8 ± 0 .1 5 ± 0 .1 3

+ 0 .3 2 + 0 .2 8 + 0 .2 5

3 .3 5 2 .8 0 2 .3 6

1 .2 5 1 .1 2 1 .0 0

+ 0 .3 2 + 0 .2 9 + 0 .2 5

± 0 .1 1 ± 0 .0 9 ± 0 .0 8

+ 0 .2 2 + 0 .1 9 + 0 .1 7

2 .0 0 1 .7 0 1 .4 0

0 .9 0 0 .8 0 0 .7 1

+ 0 .2 3 + 0 .2 0 + 0 .1 8

± 0 .0 7 ± 0 .0 6 ± 0 .0 5

+ 0 .1 5 + 0 .1 3 + 0 .1 1

1 .1 8 1 .0 0

0 .6 3 0 .5 6

+ 0 .1 6 + 0 .1 4

± 0 .0 4 ± 0 .0 3

+ 0 .1 0 + 0 .0 9

mm

1 6 .0 1 3 .2 1 1 .2

mm

µm

µm

µm

µm

µm

5 Perforated plates in test sieves 5.1 Arrangement of square holes Square holes shall be arranged in line with the centre points at the vertices of squares, as shown in Figure 5. 5.2 Arrangement of round holes Round holes shall be arranged with the centres at the apices of equilateral triangles, as shown in Figure 6. NOTE Plated mild steel is is commonly commonly supplied supplied except at the the lower end of the aperture range where brass may be found to be more suitable. The purchaser should state in the enquiry specific requirements, if any, for the material of the perforated plate.

5.3 Plate thickness Perforated plates shall be of uniform thickness and shall lie in the range given in Table 3. NOTE The nominal nominal plate plate thicknes thicknesses ses stated stated in Table Table 3 are preferred.

5.4 Pitch The pitch shall be: a) the nominal pitch stated in Table 3; or b) up to 15 % larger than the nominal nominal pitch stated in Table 3; or c) smaller than the nominal pitch stated in Table 3 provided that individual bridge widths comply with 5.5. 5.5. 5.5 Bridge width

85 0 71 0 60 0

50 0 45 0 40 0

+ 12 7 + 11 2 + 10 1

± 29 ± 25 ± 21

+ 78 + 69 + 61

No individual bridge shall be less than half of the width given by subtracting the nominal aperture size from the nominal pitch.

50 0 42 5 35 5

31 5 28 0 22 4

+ 90 + 81 + 72

± 18 ± 15 ± 13

+ 54 + 48 + 43

NOTE Minimu Minimum m bridge bridge width widthss are given given in Table Table 3. 3.

30 0 25 0 21 2

20 0 16 0 14 0

+ 65 + 58 + 52

± 12 ± 9.9 ± 8.7

+ 38 + 34 + 30

18 0 15 0 12 5

12 5 10 0 90

+ 47 + 43 + 38

± 7.6 ± 6.6 ± 5 .8

+ 27 + 25 + 22

5.7 Mounting

10 6 90 75

71 63 50

+ 35 + 32 + 29

± 5 .2 ± 4 .6 ± 4 .1

+ 20 + 18 + 17

The crevices above and below the plate at its junction with its frame shall be filled and left smooth.

63 53 45

45 36 32

+ 26 + 24 + 22

± 3 .7 ± 3 .4 ± 3 .1

+ 15 + 14 + 13

5.8 Tolerances on aperture size

38 25 20

30 25 20

+ 20 + 16 + 14

± 2 .9 ± 2 .5 ± 2 .3

+ 12 +9 +8

5.6 Workmanship Perforated plates shall be uniformly and cleanly punched. The radius at the corners of square holes shall not exceed 0.05W + 0.30 0.30 mm, mm, wher where e W is is the aperture size expressed in millimetres. The perforated plate shall be mounted with the punch entry side uppermost, i.e. burr down.

Each aperture size of an unused sieve sha ll comply with the nominal size of the sieve within the limits of tolerance shown in Table 3. NOTE Aperture Aperture size size is measur measured ed on the the centre centre lines lines of square square holes (see 5.1) 5.1) and on the diameter of round holes (see 5.2). 5.2).

NOTE The apertur aperture e sizes sizes taken taken ISO ISO 565. 565. They They are in an an R40/3 series based on 1 mm with a ratio between successive sizes of about 1:2. The siazes in bold type are the principal sizes stated in ISO 565 and are preferred.

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BS 410: 410:19 1986 86

I S B ) c ( , y 5.9 Inspection p o 5.9.1 General. The manufacturer shall test each test C sieve before sale and shall supply a record card d (see Append Appendix ix D). e (see l l o purchaser should state in his order when a more r NOTE The purchaser t detailed test, i.e. a calibration test in accordance with n o Appendix F, is required. c n 5.9.2 Survey for condition. When tested in U accordance with D.2, D.2, the perforated plate shall not , 7 show any obvious faults, e.g. irregularly formed 0 0 holes, ragged edges and burrs upward. 2 0 5.9.3 Oversize apertures. When tested in accordance 0 D.3 and D.4 no D.4 no aperture shall exceed the : with D.3 and 0 maximum dimension given in Table 3. 0 + T M G 7 5 : 1 2 : 5 0 Figure 5 — Arrangement of square holes 2 0 v o N i r F , i t c u r t s n o C g n i r e e n i g n E i a d n u y H , e e L u S Figure 6 — Arrangement of round holes g n o D : y p o C d e s n e c i L

6

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BS 410:1 410:198 986 6


Appendix A Informatio Information n to be supplied with an enquiry and order The purchaser should state the following with an enquiry and order: a) the designation of the sieve (see 3.1); 3.1); b) the sieving medium (i.e. woven wire cloth, square hole or round hole perforated plate); c) frame size and shape, and any other necessary details, e.g. nesting requirements (see 3.5) 3.5) or wire diameter (see 4.2); 4.2); d) any material requirements or restrictions for frame, sieving medium and fillets; whether statement of wire diameter is required (see 4.1 and 4.5); 4.5); e) whether a receiver is required (see 3.3); 3.3); f) whether a lid is required (see 3.3); 3.3); g) whether a more detailed test is required (see 4.6.1 and 4.6.1 and 5.9.1). 5.9.1).

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BS 410: 410:19 1986 86

I S B ) c ( , Table 3 — Perforated plate in test sieves: plate thickness, pitch of holes, minimum y p bridge width and tolerance on individual apertures o C a) Apertures a) Apertures in the range 125 mm to 4 mm; square hole and round hole d e Nominal Plate th thickness Nominal pi pitch of of ho holes Minimum br bridge Tolerance on l l aperture size width individual apertures o r t a R/20 Nominal Max. Min. n R40/3 series o series c mm mm mm mm mm mm mm mm n U 125 125 16 0 17.5 ± 1 .0 0 ,  7  112 1 40 1 4 .0 ± 0. 95 0  0 106 1 32 1 3 .0 ± 0 .9 0  2  100 1 25 1 2 .5 ± 0. 85 0  0 :  9 0 .0 11 2 1 1 .0 ± 0 .8 0 0 90.0  0 8 0 .0 3 .0 2 .0 10 0 10.0 ± 0. 70  2 .5 +  T 75.0 95 1 0 .0 ± 0.70  M  7 1 .0 90 9.5 ± 0. 65  G  63.0 63 80 8 .5 ± 0 .6 0 7 63.0  5 : 5 6 .0 71 7.5 ± 0. 55  1  2 5 3 .0 67 7.0 ± 0 .5 5 :  5  5 0 .0 63 6.5 ± 0. 55 0 2 45.0 4 5 .0 5 6. 0 5 .5 ± 0 .5 0  0  4 0 .0 5 0 .0 5 .0 ± 0 . 45 v  o 37.5  4 7 .5 5.0 ± 0 .4 5 N  i 3 5 .5 4 5 .0 4. 75 ±0.40 r  F 31.5  3 1 .5 4 0. 0 4 .2 5 ± 0 .4 0 ,  i t  2 8 .0 3 5 .5 3. 75 ± 0. 35 c  u r 2 6 .5 3 3 .5 3.5 ± 0 .3 5  t s  2 5 .0 2 .5 1 .5 3 1 .5 3. 25 ± 0. 35 n  2 .0 o 22.4  2 2 .4 2 8. 0 2 .8 ± 0 .3 0 C  2 0 .0 2 5 .0 2 .5 ± 0 . 30  g n  i 1 9 .0 2 3 .6 2.3 ± 0 .2 9 r  e  1 8 .0 2 2 .4 2 .2 ± 0 . 28 e  n i 1 6 .0 1 6 .0 2 0. 0 2 .0 ± 0 .2 7  g n 1 4 .0 18 2.0 ± 0. 26  E  i 1 3 .2 17 1.9 ± 0 .2 5 a  d  1 2 .5 16 1. 7 5 ±0.24 n  u 11.2 1 1 .2 2 .0 1 .0 14 1 .4 ± 0 .2 3  1.5 y  1 0 .0 1 2 .6 1 .3 ± 0 . 21 H  ,  9. 50 1 2 .1 1.3 ± 0 .2 1 e  e 9 .0 0  1 1 .6 1 .3 ± 0 . 20 L  u 8. 00 8 .0 0  1 0. 4 1 .2 ± 0 .1 9 S g 7 .1 0  9 .4 1. 15 ± 0 . 18 n  o 6. 70 8 .9 1.1 ± 0 .1 7  D 6 .3 0  8 .5 1 .1 ± 0. 17 : y  5. 60 5.60  1.5 2 .0 1 .0 7. 7 1 .0 5 ± 0 .1 5 p o  5 .0 0 6 .9 0. 95 ± 0 . 14 C  4. 75 6 .6 0 .9 3 ± 0 .1 4  d e  4 .5 0  6 .3 0 .9 ± 0. 14 s n  4. 00 4 .0 0 5. 8 0 .9 ± 0 .1 3 e  c i L

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BS 410:1 410:198 986 6


Table 3 — Perforated plate in test sieves: plate thickness, pitch of holes, minimum bridge width and tolerance on individual apertures b) Round Round holes only only in the the range 3.55 mm to 1 mm Nominal aperture size

Plate thickness

R40/3 series

R/20 series

Nominala

Max.

Min.

mm

mm

mm

mm

mm

3. 55 3 .5 5 2 .8 0

3. 15 2. 80 2. 50

2 .3 6 2 .0 0

2. 24 2. 00 1. 80

1 .7 0 1 .4 0

1. 60 1. 40 1. 25

1 .1 8 1 .0 0

1. 12 1. 00

Nominal pitch of holes

Minimum bridge width

Tolerance on individual apertures

mm

mm

mm

5 .2

     1 .0 0    

5 .0

0 .8 3 0 .8 3

4 .7 1 .2 5

0. 8

0 .7 8

4 .3 5 3 .7 5

± 0. 11 0 .7

0 .7

± 0. 11 ± 0 .1 1

3 .6

0 .6 7

3 .3

± 0. 10

0 .6 5 3 .1

3 .0

± 0. 09 0 .6 5

0 .6 5

± 0. 08 ± 0 .0 8

2 .7 5 0 .6 3

± 0. 11

0 .7 8 3 .9

       0 .5        

± 0. 12 ± 0 .1 1

0 .5 8

± 0. 08

0. 4 2 .6

0 .6 2 .4 5

2 .4

± 0. 08 0 .6

0 .6

± 0. 08 ± 0 .0 7

2 .2 2

0 .5 5

2 .0

± 0. 07

0 .5

± 0. 07

c) Non-ISO sizes; round holes only Nominal aperture size mm

Plate thickness Nominal mm

a

Max.

Min.

Nominal pitch of holes

mm

mm

mm

Minimum bridge width

Tolerance on individual apertures

mm

mm

150 90 75 45 3 7 .5 19

15 10 7 .5 5 3 .7 5 2 .0

± 1.55 ± 1.40 ± 1.25 ± 1.10 ± 0 .9 5 ± 0 .6 5 ± 0 .6 0 ± 0 .4 0 ± 0 .4 0 ± 0 .2 7

10

1.25

± 0.19

b

200 180b 160b 140b 1 20 70 60 35 30 15 7 .5

  2 .5 

3 .0

2. 0

  2 .0 

2 .5

1. 5

1 .5

2 .0

1. 0

NOTE 1 Bold type type signifi signifies es prefer preferred red sizes sizes.. NOTE 2 The sizes listed under under “Nominal “Nominal aperture aperture size” are the total total specified by ISO 565 for perforat perforated ed plate in test sieves. sieves. However, manufacturers of perforated plate test sieves may equip themselves for making only those sizes for which there is a demand sufficient to justify the expense of their tools. When particle sizes are being considered for products, enquiries should be made as to the stock position of test sieves, having the aperture size in mind. NOTE 3 The sizes listed listed under “Nominal “Nominal aperture aperture size” in the the R40/3 series series are based on 1 mm with a ratio ratio between successive successive sizes sizes of about 1:2 those in the R20 series have a ratio of about 1:12. The sizes in bold type are the principal sizes stated in ISO 565 and are preferred. a b

See note to 5.3 Test sieves of these aperture sizes may be made as single ring gauges. A minimum plate thickness of 3 mm is recommended.

© BSI 01-1999

9

BS 410: 410:19 1986 86

I S B ) c ( Sieving areas and aperture aperture tolerances expressed as as percentages percentages , Appendix B Sieving y p o B.1 Sieving areas and aperture tolerances C expressed as percentages are given in Table 4. d Table 4 — Sieving areas and aperture tolerances expressed as percentages e l l o Nominal Sieving areas Aperture tolerances expressed as percentages r t aperture size Wire cloth Perforated plate Wire cloth Perforated plate n Square hole Round hole Maximum Average Intermediate o c X Y Z n m m % % % % % % % U , 125 61 55 ± 0 .8 7 112 64 58 ± 0 .8 5 0 0 106 64 58 ± 0 .8 5 2 100 64 58 ± 0 .8 5 0 0 : 65 59 ± 0 .9 0 90.0 0 80.0 64 58 ± 0 .9 + 62 57 ± 0 .9 T 75.0 M 56 51 ± 0 .9 G 71.0 7 5 63.0 62 56 ± 0 .9 5 : 1 56.0 63 57 ±1 2 : 53.0 63 57 ±1 5 64 58 ±1 0 50.0 2 0 45.0 65 59 ±1 v 4 0 . 0 6 4 5 8 ±1 o 61 55 ±1 N 37.5 i 35.0 56 51 ±1 r F , i 31.5 62 56 ± 1 .5 t c 38.0 62 56 ± 1 .5 u r 2 6 . 5 6 3 5 7 ± 1 .5 t s 63 57 ± 1 .5 n 25.0 o C 22.4 64 58 ± 1 .5 g 20.0 64 58 ± 1 .5 n 19.0 i 6 5 5 9 ± 1 .5 r e 18.0 65 59 ± 1 .5 e n i 70 64 58 +7 ±3 +5 ± 1. 5 g 16.0 n 14.0 60 54 ±2 E 13.2 6 8 6 0 5 5 + 7 ± 3 + 5 ± 2 i a 12.5 61 55 ±2 d n u 11.2 67 64 58 +7 ±3 +5 ±2 y 1 0 . 0 6 1 5 5 ±2 H , 9.5 65 61 55 +7 ±3 +5 ±2 e 9.00 60 54 ±2 e L u 8.00 64 57 52 +8 ±3 +6 ± 2. 5 S 7.10 57 52 ± 2 .5 g 6 . 7 0 6 2 5 2 4 7 + 8 . 5 ± 3 + 6 ± 2. 5 n 6.30 55 50 ± 2 .5 o D : 5.60 60 49 44 +9 ±3 +6 ± 2. 5 y p 5.00 52 47 ± 2 .5 o 4 . 7 5 5 6 4 7 4 3 + 9 ± 3 + 6 ± 3 C 4 . 5 0 5 1 4 6 ± 3 d e s 4.00 55 44 40 + 10 ±3 +7 ±3 n e 3.55 42 ± 3 .5 c i 3.35 53 38 + 10 ±3 +7 ± 3 .5 L 3.15

10

40

± 3 .5

© BSI 01-1999

BS 410:1 410:198 986 6


Table 4 — Sieving areas and aperture tolerances expressed as percentages Nominal aperture size

mm 2.80

51

35

Aperture tolerances expressed as percentages Wire cloth Perforated plate Maximum Average Intermediate X Y Z % % % % + 11 ±3 +7 ±4

2.50 2.36

49

37 34

+ 11

Wire cloth

%

Sieving areas Perforated plate Square hole Round hole %

2.24

%

±3

35

± 4. 5

2.00

48

32

+ 12

±3

+8

± 4 .5

1.80 1.70

46

30 31

+ 12

±3

+8

± 4. 5 ± 5 .5

1.60 1.40 1.25 1.18 1.12 1.00

30 44 43

28 23 27

41

23 25

120a

±5 + 13

±3

+8

+ 14

±3

+9

± 5 .5 ± 6. 5 ±7

+ 15

±3

+9

±6 ±7

58

± 0 .8

a

70

55

± 0 .9

60a

58

±1

a

55

±1

a

58

± 1 .5

57

±2

51

± 2 .5

35 30

15a a

7.5 850 710

µm 40 37

+1 5 + 16

% ± 3.5 ±4

+9 + 10

600

36

+ 17

±4

+ 11

500 425 355

38 36 38

+ 18 + 19 + 20

±4 ±4 ±4

+ 11 + 12 + 12

300

36

+ 21

±4

+ 13

250 212

37 36

+ 22 + 24

±4 ± 4.5

+ 13 + 14

180 150

35 36

+ 24 + 26

±5 ±5

+ 15 + 16

125

34

+ 29

±5

+ 17

106 90 75

36 35 36

+ 31 + 33 + 36

±5 ±5 ±5

+ 18 + 19 + 21

63

34

+ 39

±5

+ 22

53 45

35 34

+ 43 + 43

±5 ±6

+ 24 + 27

38 32

31 28

+ 53 + 59

±6 ±8

+ 29 + 34

a

± 4. 5 ±4

+7

%

%

%

Non-ISO sizes; round hole perforated plate only.

© BSI 01-1999

11

BS 410: 410:19 1986 86

I S B ) c ( , y B.2 The formulae for calculating percentage sieving p o areas are as follows: C a) woven wire cloth d e l 2 l W o ---------------- × 100 r 2 t (W + d) n o c b) square hole perforated plate n U 2 W , - × 100 7 2 0 p 0 2 c) round hole perforated plate 0 0 : 2 π ( W ⁄ 2 ) × 100 0 ------------------------- 0 2 + 0.866 p T M or G 2 7 W ------- × 90.7 5 : 2 1 p 2 : 5 where 0 W is is the nominal aperture size; 2 0 d is the wire diameter (see Table 2); v o N p is the pitch (see Table 3). i maximum aperture aperture size size specified specified in in this standard standard r NOTE The maximum F for wire cloth is 16 mm; the minimum aperture size specified for , i t square hole perforated plate is 4 mm, and the minimum aperture c size specified for round hole perforated plate is 1 mm. u r t s Appendix C Inspection Inspection of woven wire n o cloth C g C.1 Principle n i r e First a survey is made of the condition of the wire e cloth, followed by a methodical examination of n i g individual apertures and finally measurements are n E made of the average aperture size. i The procedure for measurement of aperture size a d varies according to the size and number of apertures n u in the sieve (see C.4). C.4). y H C.2 Survey for condition , e Examine the wire cloth in the sieve for condition. e L NOTE For this this survey survey a uniform uniformly ly illuminate illuminated d background background is u helpful. S C.3 Oversize apertures g n Examine all openings carefully and methodically in o D order to detect oversize apertures. Assess s uspected : oversize apertures in coarse sieves with an y p engineer’s limit gauge, segmental or calliper. o Apertures in in fine fine sieves sieves may may best best be viewed when C NOTE 1 Apertures d magnified optically. e In the case of fine sieves, lack of uniformity in aperture size can s n be seen in contrast with the general pattern of apertures of e uniform size. c NOTE 2 Typical i Typical indications indications are a line of large apertures, apertures, or L local, noticeably irregular apertures. Record the location of such

C.4 Variations of aperture size Check the proportion of apertures that exceed the intermediate limit, limit, i.e. nominal aperture size + Z . Take measurements across the two diameters of the sieve frame, parallel to the warp and weft directions and/or in areas of irregular apertures as found from C.3. C.3. NOTE The measuremen measurements ts may may be carried carried out rapidly rapidly using a limit gauge in the form of a scale (see Figure 7) or by individual gauges for coarser mesh sieves. At least 100 apertures should be observed, if possible, in each direction.

Record the number of apertures whose size in either the warp or weft direction falls within the tolerance band of of (nominal (nominal + Z ) and (nom (nomina inall + Y ) and express as a proportion of the total apertures checked. NOTE This method method should should be be used to confirm confirm that that no apertures apertures exceed the maximum maximum of (nominal (nominal + X ); it may also be used to make an assessment of the distribution of the aperture width in the various tolerance bands, namely: less than than (nominal (nominal – Y ) between between (nominal (nominal – Y ) and (nominal (nominal + Y ) between between (nominal (nominal + Y ) and and (nominal (nominal + Z ) between between (nominal (nominal + Z ) and (nominal + X )

Figure 7 — Tolerance band gauge for optically optically magnified magnified sieve cloth C.5 Average size of aperture Measure the average aperture size over at least 10 apertures, if possible, in each direction in each of at least two positions on the cloth. If the results from the two fields fall in different tolerance bands and if they contradict the information obtained from C.4, C.4, check the average aperture size at more positions on the sieving surface. C.6 Record card A suitable suitable form of record card with specimen entries for a woven wire test sieve is given in Figure 8.

areas in question.

12

© BSI 01-1999

BS 410:1 410:198 986 6


Times used

Tester Date

New

Visual survey and maximum aperture

Average aperture size

Apertures above intermediate limits

Warp direction Weft direction Warp direction

ABC/86/10

Within ± Y

Within ± Y

Weft direction

Less ess tha than n 6 % Less ess tha than n 6%

NOTE It is the user’s user’s responsibilit responsibility y to ensure that that a used sieve is re-examine re-examined. d. He, or a referee, referee, should make make retests according to the circumstances, and with a frequency appropriate to the degree of use that the sieve has undergone. For further information, see Appendix H of BS 410:1986.

Figure 8 — Record card for inspection of woven wire cloth test sieve

Appendix D Inspection of perforated plate D.1 Principle First a survey is made of the condition of the perforated plate, followed by a methodical examination of individual apertures and finally measurements are taken of individual aperture size. The procedure for measurement of aperture size varies according to the size and to the number of apertures in the sieve (see D.4). D.4). D.2 Survey for condition Examine the perforated plate in the sieve for condition. D.3 Oversize apertures Examine all openings carefully and methodically in order to detect oversize apertures. Assess suspected oversize apertures in coarse sieves with an engineer’s calliper or limit gauge, segmental or calliper.

Inspect every aperture; check square holes at mid-section in both directions across and check round holes across various diameters. Use either of the following procedures for the inspection. a) In any selected area check the holes along each of two straight straight lines of at least 100 mm length and including at least 10 holes, five along each direction. NOTE The lines lines shou should ld be at at 90° or or 60° for round round holes, holes, or at 90° for square square holes. holes.

b) For square holes, check holes along a line parallel to a diagonal of the holes for at least 150 mm and and at least least eight holes. If the plate has only 20 holes or less, check every hole. D.5 Record card A suitable form of record record card with specimen specimen entries for a perforated plate test sieve is given in Figure 9.

NOTE Apertures Apertures in in finer sieves may be be viewed when magnifie magnified d optically.

Irregularity of bridge width is an indication of suspect apertures. D.4 Measurement of individual apertures Check individual apertures for compliance with the tolerances given in Table 3. NOTE Callipers, Callipers, tapered tapered plate plate gauges, gauges, segment segmental al plain plain limit limit plug gauges, or optical projection may be used.

© BSI 01-1999

13

BS 410: 410:19 1986 86

I S B ) c ( , y p o C d e l l o r t n o c n U , Times used Tester Date Visual survey Compliance with the tolerances of BS 410 7 0 New ABC 8 6 /1 1 0 2 0 0 : 0 0 + T M NOTE It is the user’s responsibi responsibility lity to ensure that that a used test sieve is re-examined. re-examined. He, or a referee, referee, should make retests retests G according to the circumstances, and with a frequency appropriate to the degree of use that the sieve has undergone. For 7 further information see Appendix H of BS BS 410:1986. 5 : Figure 9 — Record card for inspection of perforated plate test sieve 1 2 : 5 Table 5 — Mesh number Mesh number number 0 Appendix E Mesh 2 (a) Nominal aperture (b) Nominal aperture 0 Wire cloth was traditionally designated by the size 5.60 mm to to 1.00 mm mm size 850 µm to 32 µm v o weaver by the number of meshes per inch, called its Mesh Nominal Mesh Nominal N mesh count or mesh number. This method was aperture aperture number number i size size r F widely used and was, until 1962, the basic mm µm , i t designation in BS 410. The usage in industry 3 5 .6 0 18 850 c persists, particularly for the ready recognition of u r wire cloth by mesh count. 3½ 4 .7 5 22 710 t s 4 4 .0 0 25 600 n However, sieves in accordance with BS 410 a re now o C designated by aperture size, which is the 5 3 .3 5 30 500 g relationship to particle size in a test sieve analysis. n i 6 2 .8 0 36 425 r Table 5 is supplied only for information to relate e mesh number readily to aperture size. The number 7 2 .3 6 44 355 e n of meshes per inch depends on the wire diameter for i g n a given aperture size in wire cloth and a nominal 8 2 .0 0 52 300 E mesh number should be taken as an approximation. i 10 1.70 60 2 50 a d 12 1.40 72 2 12 n u y 14 1.18 85 1 80 H , 16 1.00 10 0 1 50 e e 12 0 125 L u S 15 0 106 g n 17 0 90 o D 20 0 75 : y p 24 0 63 o C 30 0 53 d e 35 0 45 s n e c 40 0 38 i L

44 0

14

32

© BSI 01-1999

BS 410:1 410:198 986 6


Appendix F Calibration Calibration tests tests F.1 General When more detailed information is required about the woven wire cloth or perforated plate in a test sieve, the acceptance test (see 4.6 and 4.6 and 5.9) 5.9) should be supplemented as described in F.2. F.2. F.2 Woven wire cloth test sieves The measurement of the average aperture width should be made in a number of fields evenly spread over the whole area of the sieve, and so chosen that no two fields are crossed by the same wire (see Figure Figure 10). The number of fields fields and the minimum number of apertures that should be measured in each field of a 200 mm diameter sieve frame, in both the warp and the weft direction separately, are given in Table 6.

Table 6 — Number of apertures to be measured in a 200 mm diameter test sieve Nominal aperture width

Number of Minimum number of consecutive apertures to be measured in fields each direction In each field

In all fields

mm

3 .3 5 2 .8 0 2 .3 6

10 10 10

3 3 4

30 30 40

2 .0 0 1 .7 0 1 .4 0

10 10 10

4 5 6

40 50 60

1 .1 8 1 .0 0

10 10

8 9

80 90

8 50

10

10

1 00

7 10 6 00 5 00

10 10 10

12 15 15

1 20 1 50 1 50

4 25 3 55 3 00

10 10 10

20 25 30

2 00 2 50 3 00

2 50 212 180

10

30

3 00

             15            

             20            

             3 00            

µm

150 125 106 90 75 63 Figure 10 — Fields of measurement in a 200 mm roun round d test test sieve sieve

53 45 38 32

In the cases of 100 mm and 300 mm diameter sieve frames, the number of fields for measurement should be 4 and 15 respectively.

© BSI 01-1999

15

BS 410: 410:19 1986 86

I S B ) c ( , y For aperture sizes larger than 3.35 mm, it is usual p o to check the size with engineers’ gauges, and 20 C and 30 apertures may may be assessed rapidly by this d means. If a sieve has 20 apertures or less, then all e l l apertures should be measured. o r t If, when making this test, the measured average n o aperture width is found to be so uniform in the f irst c n few fields that the full recommended number of U fields is not measured, then the result of the fields , 7 tested should be shown on the record card. 0 0 F.3 Perforated plate test sieves 2 0 When more detailed information is required about 0 : the apertures in the perforated plate in a test sieve, 0 0 either more apertures should be checked by limit + T gauging or the dimensions of apertures should be M measured directly. G F.4 Checking with a reference sample 7 5 : Sieves can be checked by sieving known material 1 and comparing the amount of residue on the sieve 2 : 5 with that expected. Known material can be either: 0 a) reference material with agreed particle size 2 distribution; or 0 v b) a material that has also been sieved on a set of o N master test sieves reserved for this checking i r operation. F , information ion on the availab availability ility of powders powders with i t NOTE For informat certified particle size distribution, apply to one of the following c u bodies. r t 1) Community Bureau of Reference s n BCR o Rue de la Loi 200 C B1049 Brussels g 2) National Bureau of Standards n i r Washington DC 20234 e USA e n 3) Office of Reference Materials i g Laboratory of the Government Chemist n Queens Road E i a d Appendix G Maintenance Maintenance of test sieves n u y G.1 Before each use the sieving medium and frame H , should be inspected and if necessary cleaned. The e cleaning of the sieve should be carried out with e L great care so that the sieving medium is not u S damaged. The sieving medium should not be g fingered. n o D : y p o C d e s n e c i L

16

G.2 Occasionally sieves may be washed in warm deionized water containing a liquid synthetic detergent. After washing, the sieves should be rinsed thoroughly in deionized water and dried at a temperature not exceeding 80 °C. It is important important to note that test sieves should not be heated to high temperature. The sieves may be cleaned by immersing in a suitable liquid, e.g. alcohol or deionized water in an ultrasonic bath and treated for 15 s to 20 s with a frequency not less than 30 kHz and power input not exceeding 60 W/L. G.3 Wire mesh test sieves, particularly those with a nominal aperture size smaller than 3.35 mm, should not be brushed or exposed to compressed air.

Appendix H Used Used sieves H.1 User’s tests on used sieves The sizes and tolerances in this standard apply to new sieves. With continued use, test sieves will wear; it is therefore necessary for the apertures to be remeasured from time to time. If the user is not prepared to make such periodic reinspections, recourse may be made to specialists in testing. H.2 Wear allowances on test sieves The tolerances on sieve apertures are determined by the degree of closeness to nominal values attainable in current manufacturing practice. Increases in aperture size (due to wear) which may be acceptable in service are determined by the requirements of the product, and may well be included in the product specification. They are not necessarily the same as the manufacturing tolerance. H.3 Applicability of marking The designation “TEST SIEVE TO BS 410” is not applicable when the apertures of a test sieve no longer comply with the appropriate tolerances according to the marking on the label on the sieve frame (see 3.6). 3.6).

© BSI 01-1999

BS 410:1 410:198 986 6


Publications referred to BS 1796, Method for test sieving. ISO 565, Test sieves — Woven metal wire cloth, perforated plate and electroformed sheet — Nominal sizes of openings. ISO 2395, Test sieves and test sieving — Vocabulary.

© BSI 01-1999

I S B ) c ( , y p o C d e l l o r t n o c n U , 7 0 0 2 0 0 : 0 0 + T M G 7 5 : 1 2 : 5 0 2 0 v o N i r F , i t c u r t s n o C g n i r e e n i g n E i a d n u y H , e e L u S g n o D : y p o C d BSI e 389 Chiswick High Road s n London e c W4 4AL i L

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