1、 WORLDWIDE ENGINEERING STANDARDS General Specification GMW14196 Polyurethane Foams for Acoustic Applications Copyright 2011 General Motors Company All Rights Reserved November 2011 Originating Department: North American Engineering Standards Page 1 of 5 1 Introduction Note: Nothing in this standard
2、supercedes applicable laws and regulations. Note: In the event of conflict between the English and domestic language, the English language shall take precedence. 1.1 Scope. This specification identifies polyester and polyether urethane types of sound absorbing foams used in General Motors vehicles.
3、This specification will include both molded and flat stock foams. 1.2 Mission/Theme. This specification shall encompass polyurethane foams used for acoustical applications throughout the vehicle. These polyurethane foams may be used for vibration damping, noise and shock isolation, and spacers for p
4、art retention with acoustical requirements. 1.3 Classification. Products qualified to this specification shall be identified by compression force deflection ranges per ISO 3386 at 40% compression. Type 1 2 to 25 kPa Type 2 25 to 50 kPa Type 3 50 to 99 kPa Type 4 100 to 175 kPa Type 5 175 to 450 kPa
5、Type 6 450 to 850 kPa Type 7 See 1.3.7 below 1.3.1 Type 1. This is a low modulus (soft cellular) foam which can be easily compressed and used for sound absorption, isolation and air and dust seals. 1.3.2 Type 2. This is a low modulus with a slightly higher tensile strength than Type 1. This type may
6、 also be used for sound absorption, isolation and air and dust seals. 1.3.3 Type 3. This is a slightly firmer foam which are recommended for sound absorption, noise and shock isolation, air and dust seals. 1.3.4 Type 4. This is a firm but compressible foam material and is recommended for sound absor
7、ption, noise and shock isolation, air and dust seals. 1.3.5 Type 5. This is a firmer foam than Type 4 foam yet with yielding higher compression. This type can be used for sound absorption, noise and shock isolation, spacers for part retention and air and dust seals. 1.3.6 Type 6. This is a very firm
8、 foam with high compression. This type can be used for sound absorption, noise and shock isolation, spacers for part retention and air and dust seals. 1.3.7 Type 7. Foams for this type will also be used for sound absorption, isolation, and air and dust seals, but will have unique properties which wi
9、ll distinguish them from the other foam types. Compression Force Deflection, Density, and any other unique properties pertinent to the performance of the foam, for its specific application shall be called out on the print or the math file. 2 References Note: Only the latest approved standards are ap
10、plicable unless otherwise specified. 2.1 External Standards/Specifications. FMVSS 302 ISO 1856 ISO 2589 ISO 3386 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE E
11、NGINEERING STANDARDS GMW14196 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 2 of 5 2.2 GM Standards/Specifications. GMW3059 GMW3221 GMW3259 GMW15634 GMW3182 GMW3232 GMW4217 GMW15725 GMW3205 GMW3235 GMW14177 2.3 Additional References. TMC003 Material Safety Data Sheet g
12、uidance documents (available at ). 3 Requirements 3.1 All materials tested to this specification shall be conditioned for 24 h according to GMW3221, Code A. 3.2 Mass and Thickness. Mass per unit area, per GMW3182, and thickness, per ISO 2589, of all materials for this specification shall be called o
13、ut on the engineering drawing or the math files. 3.3 Dimensional Stability. 3.3.1 For interior applications foam samples must not change more than 2.5% when tested to GMW4217. 3.3.2 For engine compartment applications, foams must not change more than 2.5% when tested according to 4.3 of GMW15725 Cla
14、ss 2 temperature requirements. 3.4 Odor (GMW3205). Report both the wet and dry results. Require a rating of 6 minimum. 3.5 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 requireme
15、nt. 3.6 Mildew (GMW3259). Required only if natural fibers are present in the construction. There shall be no visible growth or odor of mildew. 3.7 Fogging (GMW3235). Method A, Code T1 90% minimum reflectance or Method B, Y1, T1, P1, -2.0 mg maximum. 3.8 Emissions (GMW15634). Report on Volatile Organ
16、ic Compound (VOC) and Semi Volatile Organic Compound (SVOC) emissions shall be submitted. 3.9 Acoustical Performance. 3.9.1 Suppliers shall provide to GM random incidence absorption data of their cellular materials per GMW14177. 3.9.1.1 To be classified in a specific level, all data points from 500
17、to 5000 Hz must meet or exceed the minimum levels identified in Table 1. Table 1: Acoustic Performance Acoustic Pads 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
18、 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 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted witho
19、ut license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14196 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 3 of 5 Acoustic Pads Procedure GMW14177 Requirement Average Absorption Coefficient Frequency (Hz) Level A Lower Limit Level B Lower Limit Level C Lower Lim
20、it 5000 0.99 0.92 0.78 Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14196 Copyright 2011 General Motors Company All Rights Reserved No
21、vember 2011 Page 4 of 5 3.10 Compression Set (ISO 1856 Method A at 50%). 3.10.1 Compression set parameters for polyurethane foams, when tested to this specification at 50% compression shall be as follows: Types 1 and 2 10% maximum Types 3 and 4 10% maximum Types 5 and 6 15% maximum 3.11 Exterior Und
22、erhood Requirements. 3.11.1 Resistance to Fluids. Foams used in the engine compartment shall not show degradation, (swelling is permissible), after being tested to fluids; A, B, D, F, G, H, I, L, M, N, and P of Table 3 of GMW15725. 3.11.2 Heat Resistance. Materials must withstand 336 h at 150 C in a
23、n air-circulating oven with no signs of thickness increase, 2%, or any other undesirable effect that may affect the acoustic performance. 4 Validation 4.1 General. Not applicable. 4.2 Validation Cross Reference Index. Not applicable. 4.3 Supporting Paragraphs. Not applicable. 5 Provisions for Shippi
24、ng Not applicable. 6 Notes 6.1 Glossary. Not applicable. 6.2 Acronyms, Abbreviations, and Symbols. GHS Globally Harmonized System MSDS Material Safety Data Sheet SDS Safety Data Sheet SVOC Semi Volatile Organic Compound VOC Volatile Organic Compound 7 Additional Paragraphs 7.1 All materials supplied
25、 to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 7.2 Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendations valid in the country of usage. 7.3 Language. In the event of conflict between the
26、English and domestic language, the English language shall take precedence. 7.4 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 Engi
27、neering 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 documentation normally required for initial release must be complete
28、d. 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. If not otherwise agreed, all release tests shall be repeated and documented by
29、the supplier prior to commencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreed to between the responsible Engineering department and the supplier. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for Resa
30、leNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW14196 Copyright 2011 General Motors Company All Rights Reserved November 2011 Page 5 of 5 7.5 Initial Source Approval. No shipments shall be made by any supplier until representative initial
31、production samples have been approved by the appropriate Materials Engineering department(s) as meeting the requirements of this specification. 7.6 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when a change in chemical composition of an existing product
32、has occurred, a complete copy of the Material Safety Data Sheet/Safety Data Sheet must be submitted in compliance with Globally Harmonized System of Classification of Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In addition, product MSDS/SDS submissions m
33、ust be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance documents where available. 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: GMW14196 Type X Where: X indicates Type as referenced in
34、 1.3 9 Release and Revisions This standard was originated in June 2005. It was first approved by the Global Acoustics Committee in February 2006. It was first published in February 2006. Issue Publication Date Description (Organization) 1 FEB 2006 Initial publication. 2 SEP 2011 5 year refresh. (Interiors) 3 NOV 2011 2.2: Added GMW4217 3.3: Added 3.3.1 and 3.3.2. 3.11.2: Added 2% Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
