GMW 14194

Template For ENG STDS

WORLDWIDE ENGINEERING STANDARDS

Material Specification

GMW14194

Fibrous Sound Absorption Materials

1 Scope This specification identifies all types of sound absorbing and/or sound dissipative materials used in vehicles. 1.1 Material Description. Products qualified to this specification shall be identified by their general composition and areas in a vehicle where they will yield their best acoustical performance. 1.2 Symbols. Not applicable. 1.3 Applicability. All Applicability. All materials qualified to this specification shall be listed by type and recommended areas of the vehicles to be used. 1.3.1 Classification. 1.3.1.1 Type 1: Textile Fibers (Non-wovens). These type materials will contain a blend of fibrous materials that may be bound together by needling or bonding. Type 1 materials are recommended for usage in the vehicle interiors or other areas where exposure to moisture and exterior exposure is very limited. For example, these materials can be used for under carpet applications. These materials can also withstand higher heat applications and can be used in the engine compartment. 1.3.1.2 Type 2: Fiberglass. One hundred percent (100%) fiberglass, phenolic cured materials for underhood use only and not for interior applications. Type 2 materials are recommended for exterior or underhood locations where performance and exposure to chemicals will have an insignificant effect on performance. All fiberglass constructions shall have cut edges compressed around the entire circumference, and the components shall not have any extractable constituents being offensive, detrimental to health, or causing malfunctions during assembly or vehicle operation. 1.3.1.3 Type 3: 100% Polypropylene Fibers. This material will be composed of 100% fibrous polypropylene. Type 3 materials are recommended for areas where exposure to moisture will have an insignificant effect on performance. Not recommended for front of dash applications. 1.3.1.4 Type 4: One Hundred Percent (100%) Polyester Fibers. These materials will be composed of 100% polyethylene terephthalate (PET) fibers. Type 4 materials are recommended for areas where exposure to moisture will have an insignificant effect on performance. 1.3.1.5 Type 5: Fiber Blends. Type 5 materials are recommended for areas where exposure to moisture will have an insignificant effect on performance. Not recommended for engine-side front of dash applications. 1.3.1.6 Type 6: Blends of Fiberglass. These materials are blends of fiberglass with other natural and/or synthetic fibers. Not to be used for interior applications. 1.3.1.7 Type 7: Other Fibers. These materials may contain oxidized polyacrylonitrile fibers or other fibers or fiber blends which meet acoustic and/or t hermal requirements for specific applications. 1.4 Remarks. Materials intended to be used in substrate applications must also meet the assem bly performance requirements per GMW14444 as assembled.

2 References Note: Only the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. FMVSS 302 ISO 8510-2

ISO 9073-2

ISO/IEC 17025

UL 94 V-0

© Copyright 2015 General Motors Company All Rights Reserved

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GM WORLDWIDE ENGINEERING STANDARDS

GMW14194


2.2 GM Standards/Specifications. GMW3059 GMW3182 GMW3205 GMW3221

GMW3232 GMW3235 GMW3259 GMW14124

GMW14177 GMW14444 GMW14695 GMW15634

GMW16535 GMW16853 GMW16998

3 Requirements 3.1 Requirements on Test Specimens. Reference GMW3221. 3.2 Emissions Testing of Interior Materials and Parts. For all Code E designated parts per GMW14444, reference GMW16853 for emissions testing of interior materials and parts. 3.2.1 Emissions (GMW16853). 3.2.2 Type 1 Textile Fibers. 3.2.2.1 Volatile Organic Compound (VOC) per GMW15634 ≤100 µg/g. 3.2.2.2 Semi-volatile Organic Compound (SVOC) per GMW15634 ≤250 µg/g. 3.2.2.3 Carbonyls per GMW16535. 

≤8 mg/g Formaldehyde



≤8 mg/g Acetaldehyde



≤8 mg/g Acrolein

3.2.2.3.1 Sum of carbonyls to be ≤20 mg/g. 3.2.3 Types 3, 4, 5 and 7 Fibers. 3.2.3.1 VOC per GMW15634 ≤50 µg/g. 3.2.3.2 SVOC per GMW15634 ≤100 µg/g. 3.2.3.3 Carbonyls per GMW16535. 

≤8 mg/g Formaldehyde



≤8 mg/g Acetaldehyde



≤8 mg/g Acrolein

3.2.3.3.1 Sum of carbonyls to be ≤20 mg/g. 3.3 Lab Requirements. Lab testing shall be performed by a laboratory that meets requirements of ISO/IEC 17025 and is acceptable to the responsible GM Department. Test reports must conform to 5.10.2 and 5.10.3 of ISO/IEC 17025. Supplier shall submit a letter of compliance. 3.3.1 All required information shall be reported on the Construction Specification Data F orm (see Appendix A). The form shall be submitted along with each acoustic material submitted for engineering approval. 3.4 Material Requirements. 3.4.1 All test specimens shall be conditioned to GMW3221, Code A for a minimum of 24 h, prior to testing, unless otherwise specified. 3.4.2 Mass per unit area, per GMW3182, and thickness, per ISO 9073-2, of all materials for this specification shall be called out on the engineering drawing or the math files. All mass per unit area and thicknesses recorded for each part shall have a tolerance of ±10%. 3.4.3 Internal Bond Strengths. 3.4.3.1 Internal bond strengths of needled or non-woven fibrous materials shall be no less than 20 N/100 cm 2 when tested to GMW14695. 3.4.3.2 Internal bond strength of resinated needled fibers to be at 30 N/100 cm 2 when tested to GMW14695. 3.4.3.3 Internal bond strength of molded fiberglass shall be no less than 15 N/100 cm GMW14695.

2

when tested to

3.4.3.4 Some melt-blown insulations without a scrim shall meet all requirements except internal bond strength requirements.


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GMW14194


3.4.4 Acoustic Performance Requirements. Suppliers must provide to GM random incidence absorption data of their fibrous materials per GMW14177. 3.4.4.1 To be classified in a specific level, all data points from 500 Hz to 5000 Hz must meet or exceed the minimum levels identified in Table 1. Table 1: Acoustic Performance

Note 1

Acoustic Pad Procedure

GMW14177

Requirement

Average Absorption Coefficient

Frequency (Hz)

Level A Lower Limit

Level B Lower Limit

Level C Lower Limit

500

0.53

0.38

0.18

630

0.64

0.50

0.29

800

0.76

0.60

0.39

1000

0.86

0.69

0.50

1250

0.93

0.76

0.58

1600

0.97

0.81

0.64

2000

0.99

0.86

0.69

2500

0.99

0.89

0.72

3150

0.99

0.91

0.75

4000

0.99

0.92

0.77

5000

0.99

0.92

0.78

Note 1: Material performance level can be different than vehicle performance level.

3.5 Odor (GMW3205 Codes A2, B2). Report both wet and dry results. Rating of 6 minimum. 3.6 Flammability (GMW3232). Must comply with FMVSS 302. Test to GMW3232. Note: If the material is a composite or is to be used in a composite, the composite must meet this requirement. 3.7 Mildew (GMW3259). Required only if natural fibers are presen t in the construction. There shall be no visible growth or odor of mildew. 3.8 Fogging Volatility of Organic Constituents (GMW3235, Method B). Gravimetric procedure: Bath temperature to be set at T2, cooling temperature of 21 °C, 18 h test time, 24 h post-conditioning time. The amount of fog when weighed shall be ≤2.0 mg. Samples that result in a residue that forms a transparent film, discernible droplets (0.05 mm in diameter), or any visual signs of crystallinity, when viewed at 40x magnification shall be judged to have not passed this requirement. Provide a 40x magnified picture of each fog plate with the results. 3.9 Dust (GMW16998). All fibrous materials must have less than 1% dust when tested to GMW16998. 3.9.1 Edge Treatments (As Required for Dust Irritant Control). 3.9.1.1 Compressed Edges. Compressed to a maximum thickness of 3 mm, unless specified otherwise. 3.9.1.2 Edge Trimming. a.

Pinched edges, preferred when possible.

b.

Water-jet trimming, as required by geometric shape.

3.10 Underhood Requirements.


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GMW14194

3.10.1 There shall be no deterioration of performance of Types 1, 2, and 4 fibrous materials used in or adjacent to engine compartment applications. Types 1, 2, and 4 materials must withstand 20 cycles of GMW14124, Cycle R. 3.10.2 Resistance to Chemicals. Fibrous materials used in engine compartment shall not breakdown or show degradation after immersion in the following chemicals for 30 minutes and allowed to drain for 24 h: 

Transmission Fluid



Gasoline/Alcohol Blend



Diesel Fuel



Coolant



Motor Oil



Windshield Washer Fluid



Brake Fluid



Power Steering Fluid



Sulfuric Acid 10% or Battery Acid



Grease (Shell Vaseline 8401)

3.10.3 Water Immersion. The materials shall be immersed for 2 h in water at 95 °C ± 5 °C (no rapid boiling) without any evidence of binder breakdown. Slight color bleed in the water is acceptable and not cause for rejection. 3.10.4 Heat Resistance. Materials must withstand 336 h at 180 °C in an air-circulating oven with no signs of thickness increase, delamination, deterioration or any other undesirable effect that may affect the performance. 3.10.5 Wrinkling. There shall be no wrinkles, air voids or fiber fusion lumps on the face side of the substrate which transmit to the face side of the finished assembly. 3.10.6 Adhesive Strength (ISO 8510-2). For production intent composite materials (e.g., including but not limited to, Al foil bonded to hood insulator), crosshead speed shall be 305 mm/minute. A minimum of three specimens per test per condition shall be tested. Adhesive strength must be ≥5 N/cm after each condition. Also, report visual evaluations and failure mode. The average peel strength (newton/centimeter (N/cm)) shall be, at a minimum, the values listed in Table 1 or the adhesion must exceed the cohesive strength of core material (i.e., cohesive failure). The substrate for all testing shall be e-coated steel. If the material is to be adhered to another type of substrate (e.g., plastic), separate peel strength requirements may be necessary. 3.10.6.1 Initial. Test at room temperature after each of the following dwell times: 

20 minutes



24 h

3.10.6.2 Heat Age. Test per each of the following temperature and time combinations. Visually evaluate every 50 h. 

250 h at 79 °C ± 2 °C



250 h at 121 °C ± 2 °C



250 h at 178 °C ± 2 °C

3.11 Flammability. GMW3232 materials must meet requirements of GMW3232. 3.11.1 UL 94 V-0. This requirement is only applicable to vehicles which are capable of carrying 15 or more passengers. All materials located directly over a heat source or within 100 mm of a heat source must comply with the Underwriters Laboratory (UL) UL 94 V-0 flammability requirements. Note: If the material is a composite or is to be used in a composite, the composite must meet this requirement. 3.11.2 UL 94 V-0. All materials located directly over a heat source or within 100 mm of a heat source must comply with the UL 94 V-0 flammability requirements. 3.11.3 GMW3232. Those materials not requiring UL 94 V-0 requirements must meet the requirements of GMW3232. © Copyright 2015 General Motors Company All Rights Reserved

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GMW14194

Note: Regional specifications will apply due to variations in requirements between regions.

4 Manufacturing Process Not applicable.

5 Rules and Regulations 5.1 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendations valid in the country of usage. 5.2 Language. In the event of conflict between the English and domestic language, the English language shall take precedence. 5.3 Inspection and Rejection. Samples of components or materials released to a GM material specification shall be tested for conformity with the requirements of this material specification and approved by the responsible Engineering department prior to commencement of delivery of bulk supplies. A new approval must be received for any changes, e.g., properties, manufacturing process, location of manufacture, etc. If not otherwise agreed, all testing and docum entation normally required for initial release must be completed. It is the responsibility of the supplier to inform the customer in a timely manner, without solicitation, and to include documentation of all modifications of materials and/or processes and to apply for a new release. 5.4 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical composition of an existing product has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in compliance with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. 5.5 All materials supplied to this standard must comply with the requirements of the International Material Data System (IMDS) and GMW3059, Restricted and Reportable Substances.

6 Approved Sources The appropriate GM Materials Engineering depar tment(s) must confirm material as meeting the requirements of this specification. Any test data sheets of material subm itted to General Motors for such confirmation (e.g., during Production Part Approval Process (PPAP)) under this material specification must list all properties and must apply corresponding test methods of this material specification.

7 Notes 7.1 Glossary. Not applicable. 7.2 Acronyms, Abbreviations, and Symbols. GHS

Globally Harmonized System of Classification and Labeling of Chemicals

ID

Identification

IMDS

International Material Data System

MSDS

Material Safety Data Sheet

N/cm

Newton/centimeter

No.

Number

PET

Polyethylene Terephthalate

PPAP

Production Part Approval Process

SDS

Safety Data Sheet

SVOC

Semi-Volatile Organic Compound

UL

Underwriters Laboratory

VOC

Volatile Organic Compound


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GMW14194

8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW14194 Type X Where: X indicates type of fiber used as referenced in 1.3.

9 Release and Revisions This standard was originated in June 2005. It was first approved by the Global Acoustics Team in February 2006. It was first published in February 2006. Issue

Publication Date

Description (Organization)

1

FEB 2006

2

FEB 2010

Added acoustic and thermal requirements, table and editorial changes. (Global Acoustics Materials Team)

3

FEB 2014

Added Lab, Edge Treatment, Adhesive, and Emission requirements. Flammability requirements per UL 94 V0 added. Added reference to GMW16998 for dust. (Textiles & Trim Materials Global Subsystem Leadership Team)

4

MAY 2014

Added Types 6 and 7. Added Table Note to Table 1. (Textiles & Trim Materials Global Subsystem Leadership Team)

5

OCT 2014

Changed ISO 8510-1 to ISO 8510-2 and added heat age requirement in paragraph 3.10.6.2. (Materials-Textiles & Trim Materials Global Subsystem Leadership Team)

6

OCT 2015

Removed references to GMW15347. (Materials - Textiles & Trim Materials Global Subsystem Leadership Team)

Initial publication.

Cross Reference of Replaced Material Coding GMW14194 Material Codes Type I

Formerly Identified As TM 373700 (GME) TM 223800 (GME) GM2213M (GMNA) GM2221M (GMNA) GM2222M (GMNA)

Type II

GM2215M (GMNA)

Type III

GM2227M (GMNA)

Type IV

TM 227400 (GME) GM2722M (GMNA) GMN10034 (GMNA)

Type V

TM 153600 (GME) GM2226M (GMNA)


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GMW14194


Appendix A Data Form A1: Construction Specification Data Form Supplier:

Date:

Laboratory:

Vendor ID/PC No:

GM Code:

Part Name:

GM Color Code:

Merge ID No:

Test Engineer:

Signature:

Date: _______

F LINE No.

X X

3.4.2

X X X

3 specimens

Weight (GMW3182)

Meets

COMMENTS

g/m²

Internal Bond Strength Needled or non woven fibrous materials (GMW14695)

20 N/100 cm²

3.4.3.2

Resinated needled fibers (GMW14695)

30 N/100 cm²

3.4.3.3

Molded fiberglass (GMW14695)

15 N/100 cm2

3.4.4

RESULTS

mm

3.4.3.1

3.5

Acoustic Performance Requirements (GMW14177) Rating 6 minimum

Odor (GMW3205)

X X

Wet (Code A2) Dry (Code B2) 3.11

X X X X X

SPECIFICATION

Thickness (ISO 9073-2) 3.4.3

X

TEST

Does NOT Meet

Flammability (GMW3232 or UL 94 V-0)

Attach Data Form

After Conditioning After Aging 3.7

Mildew (GMW3259)

No mildew

3.8

Fogging (GMW3235)

2.0 mg minimum

3.10.1 Deterioration of performance (GMW14124 Cycle R) 3.10.2 Resistance to Chemicals

X X X

Transmission fluid

X X X

Coolant

X X X X

Brake fluid

X Notes:

Gasoline/Alcohol blend Diesel fuel Motor oil Windshield washer fluid Power steering fluid Sulfuric acid 10% or Battery acid Grease (Shell Vaseline 8401) 3.9

Dust GMW16998

ID = No. =

≤1

Identification Number


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GMW 14194

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