British Standard
A single copy of this British Standard is licensed to chris sharkey
on March 26, 2002 I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : y p o C d e s n e c i L
This is an uncontrolled copy. Ensure use of the most current version of this document by searching British Standards Online at bsonline.techindex.co.uk
BRITISH STANDARD
BS 3900-H4: 1983 ISO 4628/4:1982 [Cracking]
Methods of test for paints
Part H4: Designation of degree of cracking — [ISO title: Paints and varnishes — Evaluation of degradation of paint coatings — Designation of intensity, quantity and size of common types of defect — Part 4: Designation of degree of cracking] I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : y p o C d e s n e c i L
It is recommended that this Part be read in conjunction with the general information in the Introduction to BS 3900, issued separately.
UDC 667.613.72:620.191.33
BS 3900-H4:1983
National foreword This Part of BS 3900 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee. It is identical with ISO 4628/4-1982 “ Paints and varnishes — Evaluation of degradation of paint coatings — Designation of intensity, quantity and size of common types of defect — Part 4: Designation of degree of cracking ”, published by the International Organization for Standardization (ISO). Terminology and conventions. The text of the international standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”; and wherever the words “this part of ISO 4628” and “ISO 4628/4” appear they should be read as “this Part of BS 3900” and “BS 3900-H4” respectively. Cross references International Standards
ISO 4628/1-1982
I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : y p o C d e s n e c i L
ISO 4628/2-1982 ISO 4628/3-1982 ISO 4628/5-1982
Corresponding British Standards
BS 3900 Methods of test for paints Part H1:1983 Designation of intensity, quantity and size of common types of defect: general principles and rating schemes (Identical) Part H2:1983 Designation of degree of blistering (Identical) Part H3:1983 Designation of degree of rusting (Identical) Part H5:1983 Designation of degree of flaking (Identical)
A British Standard does not 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 1 to 4, an inside back cover and a back cover. This British Standard, having been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee, was published under the authority of the Board of BSI and comes into effect on 29 April 1983 © BSI 03-1999
The following BSI references relate to the work on this standard: Committee reference PVC/10 Draft for comment 80/50329 DC
ISBN 0 580 13095 9
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 cover.
Amendments issued since publication Amd. No.
Date of issue
Comments
BS 3900-H4:1983
Contents
National foreword 0 1 2 3 4
Page Inside front cover
Introduction Scope and field of application Reference Rating Test report
1 1 1 1 1
Figure 1 — Cracking without preferential direction Figure 2 — Cracking with one preferential direction
2 3
Table — Rating scheme for the designation of the size of cracks
1
Publications referred to
Inside back cover
I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : y p o C d e s n e c i L © BSI 03-1999
i
I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : y p o C d e s n e c i L
ii
blank
BS 3900-H4:1983
0 Introduction This International Standard is one of a series of standards dealing with the sampling and testing of paints, varnishes and related products.
Class
Size of cracks
0
not visible under X 10 magnification
1
only visible under magnification up to X 10
2
just visible with normal corrected vision
— Part 2: Designation of degree of blistering;
3
clearly visible with normal corrected vision
— Part 3: Designation of degree of rusting;
4
large cracks generally up to 1 mm wide
— Part 5: Designation of degree of flaking;
5
very large cracks generally more than 1 mm wide
The other parts of ISO 4628 already published or in course of preparation are: — Part 1: General principles and rating schemes;
— Part 6: Designation of degree of chalking. 1) Part 1 of ISO 4628 defines the system for designating the quantity and and size of common types of defects of paint coatings and outlines the basic principles of the system in respect of designation of the quantity and size of defects, in particular the defects caused by ageing and weathering. Parts 2 to 6 provide auxiliary pictorial or other reference scales for rating particular types of defect. As far as possible, these scales are based on existing well-established schemes. I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : y p o C d e s n e c i L
Table — Rating scheme for the designation of the size of cracks
1 Scope and field of application This part of ISO 4628 provides pictorial standards for designating the degree of cracking of paint coatings.
2 Reference ISO 4628/1, Paints and varnishes — Evaluation of degradation of paint coatings — Designation of intensity, quantity and size of common types of defect — Part 1: General principles and rating schemes.
3 Rating Rate the quantity of cracking by reference to Table 2 of ISO 4628/1 and using as examples Figure 1 or Figure 2, depending on the type of cracking. NOTE Figure 1 shows cracking without preferential direction and Figure 2 shows cracking in one preferential direction which occurs with anisotropic substrates such as wood. Other forms of cracking occur, but the principles of rating of quantity remain the same.
Designate the average size of the Cracks according to the classification given in the table.
If possible, indicate the depth of cracking by reference to the level in the coating system to which the cracks penetrate. Three main types of failure by cracking are to be distinguished: a) surface cracks which do not fully penetrate the top coat; b) cracks which penetrate the top coat, the underlying coat(s) being substantially unaffected; c) cracks which penetrate the whole coating system.
4 Test report The test report shall contain at least the following information: a) the type and identification of the product tested; b) a reference to this International Standard (ISO 4628/4); c) the numerical rating of the quantity of cracking; d) the numerical rating of the size of cracking; e) the depth of cracking (a, b, or c), where possible, for example: cracking 2 (S3) b If necessary, the standard assessment may be amplified in words, for example “linear cracking”. The use of such comments shall, however, be avoided wherever possible; e) the date of the examination.
1)
At present at the stage of draft.
© BSI 03-1999
1
BS 3900-H4:1983
I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : y p o C d e s n e c i L
Figure 1 — Cracking without preferential direction [Panels of 1 to 2 dm2 (see Table 2 of ISO 4628/1)]
2
© BSI 03-1999
BS 3900-H4:1983
I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : y p o C d e s n e c i L
Figure 2 — Cracking with one preferential direction (for example due to brush marks or wood grain) [Panels of 1 to 2 dm2 (see Table 2 of ISO 4628/1)]
© BSI 03-1999
3
I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : y p o C d e s n e c i L
4
blank
BS 3900-H4:1983
Publications referred to See national foreword.
I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : y p o C d e s n e c i L © BSI 03-1999
I S B ) c ( , y p o C d e l l o r t n o c n U , 2 0 0 2 , 6 2 h c r a M , y e k r a h s s i r h c : BSI y p 389 Chiswick High Road o C London d W4 4AL e s n e c i L
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
BSI Ð British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions
British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this British Standard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front cover. Tel: 020 8996 9000. Fax: 020 8996 7400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards
Orders for all BSI, international and foreign standards publications should be addressed to Customer Services. Tel: 020 8996 9001. Fax: 020 8996 7001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as British Standards, unless otherwise requested. Information on standards
BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel: 020 8996 7111. Fax: 020 8996 7048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel: 020 8996 7002. Fax: 020 8996 7001. Copyright
Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means ± electronic, photocopying, recording or otherwise ± without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070.
