1、 WORLDWIDE ENGINEERING STANDARDS Material Specification GMW16960 Flexible Cellular Materials Polyurethane Foams Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 1 of 5 1 Scope This specification provides a system for specifying significant properties of commonly used polyuret
2、hane foams. This specification applies to slab, bonded, and molded flexible cellular products. Urethane foam may be generally defined as an expanded cellular product produced by the interaction of active hydrogen compounds, water and isocyanates. This standard does not apply to foam made from vinyl
3、chloride and polyolefin polymers. For specifying vinyl chloride foams use ASTM D1565, Specification for Flexible Cellular Materials Vinyl Chloride Polymers and Co-Polymers - Open Cell Foam, or ASTM D1667, Specification for Flexible Cellular Materials Vinyl Chloride Polymers and Co-Polymers - Closed
4、Cell Foam. For specifying polyolefin foams, like polyethylene foams, use GMW15063, Polyolefin Foams Non-crosslinked and Cross-linked for General Applications. 1.1 Material Description. This specification covers two types of flexible urethane foam based on application. Type I: Non-acoustical applicat
5、ions. Type II: Acoustical applications. Not specified by GMW14196. 1.2 Symbols. Not applicable. 1.3 Typical Applications. The foam approved for this specification is to be used for general applications in the interior of the vehicle. 2 References Note: Only the latest approved standards are applicab
6、le unless otherwise specified. 2.1 External Standards/Specifications. ASTM D1565 FMVSS 302 ISO 1856 ISO 3386 ASTM D1667 ISO 845 ISO 2439 ISO 8067 ASTM D3574 ISO 1798 2.2 GM Standards/Specifications. GMW3059 GMW3232 GMW14357 GMW15634 GMW3205 GMW3235 GMW15063 GMW15635 GMW3221 GMW14196 2.3 Additional R
7、eferences. TMC003 Material Safety Data Sheet guidance documents (available at ). 3 Requirements Unless otherwise specified, all tests will be performed under standard conditions of 23 C 2 C and in an atmosphere of 50% 5% relative humidity (RH). 3.1 Requirements on Test Specimens. Reference GMW3221.
8、3.2 Description of Terms Specific to Standard. 3.2.1 Bonded Foam. A product produced by the adhesion of small pieces of urethane foam to each other with a suitable bonding agent. 3.2.2 Core. The internal portion of a molded part, free of skin. 3.2.3 Molded Foam. A cellular product having the shape o
9、f the enclosed chamber in which it is forming. 3.2.4 Skin. The smooth surface layer of molded foam product formed by contact with the mold or surface. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted witho
10、ut license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16960 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 2 of 5 3.2.5 Slab. A section of foam that is cut from the internal portion of a large bin. 3.3 Suffix Letters. Suffix letters may be added to the type designat
11、ion singly or in combination to indicate the necessary requirements. 3.3.1 The significance of the approved suffix letters is given in Table 1. Table 1: Suffix Letter Designations Suffix Property A Density B1 Indentation Force Deflection Test - 25% Deflection (Minimum) B2 Indentation Force Deflectio
12、n Test C Compression Deflection D Compression Set E Tensile Strength F Tear Strength G Air Flow Resistance H Ozone or Weather Resistance J Steam Autoclave Resistance K Heat Aging L Flammability O Odor Resistance P Fogging Q Volatile Organic Compound (VOC) and Semi-volatile Organic Compound (SVOC) R
13、Carbonyl Z Special Requirements 3.4 Suffix Numbers. Suffix letters may be followed by a suffix number. Suffix numbers for some of the commonly specified properties are detailed in Table 2. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo repr
14、oduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16960 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 3 of 5 Table 2: Suffix Number Designations Suffix Letter Property Test Methods Units Maximum or Minimum Suffix Numbers 1
15、2 3 4 5 6 7 A Density (Tolerance of density to be specified on drawing) ASTM D3574 (Test A)/ISO 845 Kg/m3 (psi) Maximum 25 30 50 65 80 95 130 (1.5) (2.0) (3.0) (4.0) (5.0) (6.0) (8.0) B1 Indentation Force Deflection ASTM D3574 (Test B1) at 25% Deflection, or N Minimum 20 40 60 80 100 140 200 B2 B3 I
16、ndentation Force Deflection Indentation Force deflection ASTM D3574 (Test B1) at 65% Deflection ISO 2439, Method C at 40% Deflection N N Maximum 80 100 150 200 250 300 350 C1 C2 Compression Force Deflection Compression Force Deflection ASTM D3574 (Test C), 25% Deflection/ ISO 3386-1 to 25% Deflectio
17、n ASTM D3574 (Test C), 50% Deflection/ ISO 3386-1 (40%) kPa (psi) kPa (psi) Minimum Minimum 5 5 10 10 20 20 30 30 50 50 100 100 170 170 D Compression Set ASTM D3574 (Test D)/ISO 1856-A % Maximum 10 15 20 25 E Tensile Strength ASTM D3574 (Test E)/ISO 1798 kPa Minimum 50 80 120 200 300 400 F Tear Stre
18、ngth ASTM D3574 (Test F)/ISO 8067 Method A Nm Minimum 100 150 175 200 225 250 300 G Air Flow ASTM D3574 (Test G) sm3-103 Maximum To Be Specified on Drawing No Cracking or Material Breakdown J Steam Autoclave Resistance ASTM D3574 (Test J2) GMW14357-E % Change in Compression Force Deflection (CFD) Ma
19、ximum 10 20 30 40 50 K Heat Aging ASTM D3574 (Test K) % Change in Tensile Strength Maximum -5 -10 -15 -20 -25 -30 -40 L Flammability GMW3232 Must comply with FMVSS 302 O Odor Resistance GMW3205 Code A4 and B4 Rating Minimum 6 6 6 6 6 6 6 P Fogging GMW3235 Method B-Y1-T1 (gravimetric, 1 day pre-dryin
20、g, +90 C test temperature) Gloss Reading mg 60 Minimum Maximum 85 C 2 95 C 2 110 C 2 2 2 2 2 Q VOC and SVOC GMW15634 R Carbonyl GMW15635 3.5 Example or Sample Callout. GMW16960 Type II A2 C1 D 1 E2 F3 J2 K5 06 P2 Q. Copyright General Motors Company Provided by IHS under license with General Motors C
21、ompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16960 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 4 of 5 This represents an acoustical polyurethane foam having a nominal density of 30 kg/m3, a
22、 minimum compression deflection force of 5 kPa, a maximum compression set of 10%, a minimum tensile strength of 80 kPa, a minimum tear strength of 175 Nm, a maximum change in compression deflection force after steam autoclave exposure of 20%, a maximum change in tensile strength after heat aging of
23、-25%, a minimum odor rating of 6, a maximum weight loss of 2 mg for fogging, and acoustical requirements per GMW14196. 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 th
24、e 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 requireme
25、nts 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 a
26、nd documentation 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. If not o
27、therwise agreed, all release tests shall be repeated and documented by 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. 5.4 Material Safety Data Sheets
28、/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 Lab
29、eling of Chemicals (GHS) requirements or other country-specific MSDS/SDS requirements. In addition, product MSDS/SDS submissions must be in compliance with specific country General Motors TMC003 Material Safety Data Sheet/Safety Data Sheet guidance documents where available. 5.5 All materials suppli
30、ed to this standard must comply with the requirements of GMW3059, Restricted and Reportable Substances for Parts. 6 Approved Sources Materials supplied to this specification must be approved by General Motors. A list of approved materials can be found in MATSPC. This GM Material File is provided to
31、third parties to reduce redundant testing of materials. If approved material already listed is used, the part supplier can use GM Material File reference for Production Part Approval Process (PPAP) material approval. If the decision is made to use a not yet approved material, contact the GM Foam Spe
32、cialist for details on the approval process. The material approval process must be completed prior to PPAP start date of the part supplied to General Motors. 7 Notes 7.1 Glossary. MATSPC: Global repository of GM approved materials for corresponding GM Engineering Standards. 7.2 Acronyms, Abbreviatio
33、ns, and Symbols. CFD Compression Force Deflection GHS Globally Harmonized System of Classification and Labeling of Chemicals MSDS Material Safety Data Sheet PPAP Production Part Approval Process RH Relative Humidity Copyright General Motors Company Provided by IHS under license with General Motors C
34、ompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16960 Copyright 2013 General Motors Company All Rights Reserved June 2013 Page 5 of 5 SDS Safety Data Sheet SVOC Semi-volatile Organic Compound VOC Volatile Organic Compound
35、 8 Coding System This standard shall be referenced in other documents, drawings, etc., as follows: Material per GMW16960 9 Release and Revisions This standard was originated in May 2013. It was first approved by the Textiles & Trim Materials Global Subsystem Leadership Team in June 2013. It was first published in June 2013. Issue Publication Date Description (Organization) 1 JUN 2013 Initial publication. Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
