1、WORLDWIDEENGINEERINGSTANDARDSMaterial Specification GMW16938High Density Olefinic Foam Copyright 2013 General Motors Company All Rights ReservedMarch 2013 Page 1 of 41 Scope1.1 Material Description. This standard covers the properties of a high density olefinic foam which isprocessed by combining an
2、 olefinic resin and a blowing agent. The olefinic resin can be either polyethylene orpolypropylene based.1.2 Symbols. The material abbreviations according to ISO 11469 are listed in Table 1.1.3 Typical Applications. Typical applications include the following: Bumper energy absorbers, knee bolsters.1
3、.4 Remarks. The classification into types is according to the different ranges of density.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.ISO 844 ISO 845 ISO 114692.2 GM Standards/Specifications.GMW3013 GMW3221 GMW1
4、4444GMW3059 GMW3232 GMW14650GMW3205 GMW3235 GMW156342.3 Additional References.TMC003 Material Safety Data Sheet guidance documents (available at ).3 RequirementsMaterials approved to this specification shall meet the requirements of GMW3013, General Requirements forHandling of Technical Terms of Del
5、ivery of Plastics.3.1 Requirements on Test Specimens. Important physical and mechanical properties that characterize thematerial are summarized in Table 1.3.2 Chemical Requirements. All parts manufactured from molding compounds shall be resistant to the mediathey contact at their place of use.3.3 Re
6、quirements on Materials. See Table 1.3.4 Requirements for Use in Interior. See Table 2. These requirements shall be met in addition to therequirements in Table 1.3.4.1 All finished parts for Interior applications shall meet the requirements according to GMW14444.3.5 Requirements for Use on Exterior.
7、 The following requirements shall be met in addition to therequirements in Table 1.3.5.1 All finished parts for exterior applications shall meet the requirements according to GMW14650.3.6 Conditioning. All test pieces shall be conditioned to GMW3221 Code A.3.7 Required Performance Values. All requir
8、ements listed in Table 1 and Table 2, if necessary, shall befulfilled by the delivered foam and shall be documented by the supplier in the Foam Certification Data Formaccording to Appendix A.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo re
9、production or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16938 Copyright 2013 General Motors Company All Rights ReservedMarch 2013 Page 2 of 43.8 Compressive Strength, Stress, Modulus Test Method (ISO 844 Modification). For Type 2 construction,the sample
10、specimen specified in “Dimensions” section according to ISO 844 is modified from a100 mm x 100 mm x 50 mm solid block to a cartridge style design 100 mm x 100 mm x 50 mm thickness anddivided into nine equal cells (matrix of 3 x 3), see Figure 1. The wall stock is drafted at 0.5 to simulateproduction
11、 intent. The internal radii of this cartridge should be half the nominal wall thickness, internal radius =0.5 x nominal wall; e.g. 4 mm nominal wall yields 2 mm internal radius. Also “Preparation” section of ISO 844 ismodified to include “test specimen shall be molded to maintain 100 % skin on the c
12、ompression test cartridge.”Figure 1: Compression Property SpecimenTable 1: Physical and Mechanical PropertiesProperties Standard Type1 2 3Tested Thickness 4 mm and 5 mm 4 mm 5 mmPlastic Symbol PE-LLDPE-LLDPE-LLD 3600 kPa 5400 kPa 4200 kPaCompressive Stress ISO 844 Note 3 3500 kPa 5300 kPa 4100 kPaCo
13、mpressive Modulus ISO 844 Note 2 95 000 kPa 140 000 kPa 100 000 kPaNote 1: Based on overall part and volumeNote 2: ISO 844 modified as described in paragraph 3.8.Note 3: ISO 844 modified as described in paragraph 3.8, test at 10 % relative deformationTable 2: Additional Requirements for Use in Inter
14、iorProperties StandardType1 2 3Flammability GMW3232 SE or 100 mm/minuteResistance to Odor GMW3205-B2 Rating 6 minimumEmissions GMW15634 VOC 300 g/gSVOC 750 g/gVOC 200 g/gSVOC 500 g/gVOC 200 g/gSVOC 500 g/gFogging GMW3235Method B-Y1-T1 2 mg4 Manufacturing ProcessNot applicable.Copyright General Motor
15、s Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW16938 Copyright 2013 General Motors Company All Rights ReservedMarch 2013 Page 3 of 45 Rules and Regulations5.1
16、Legal Regulations. All materials must satisfy applicable laws, rules, regulations and recommendationsvalid in the country of usage.5.2 Language. In the event of conflict between the English and domestic language, the English language shalltake precedence.5.3 Inspection and Rejection. Samples of comp
17、onents or materials released to a GM material specificationshall be tested for conformity with the requirements of this material specification and approved by theresponsible Engineering department prior to commencement of delivery of bulk supplies.A new approval must be received for any changes, e.g
18、., properties, manufacturing process, location ofmanufacture, etc. If not otherwise agreed, all testing and documentation normally required for initial releasemust be completed.It is the responsibility of the supplier to inform the customer in a timely manner, without solicitation, and toinclude doc
19、umentation 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 the supplier prior tocommencement of delivery of non-conforming bulk supplies. In individual cases, a shorter test can be agreed
20、to between the responsible Engineering department and the supplier.5.4 Material Safety Data Sheets/Safety Data Sheets (MSDS/SDS). For new product submissions, or when achange in chemical composition of an existing product has occurred, a complete copy of the Material SafetyData Sheet/Safety Data She
21、et must be submitted in compliance with the Globally Harmonized System ofClassification and Labeling of Chemicals (GHS) requirements or other country-specific MSDS/SDSrequirements. In addition, product MSDS/SDS submissions must be in compliance with specific countryGeneral Motors TMC003 Material Saf
22、ety Data Sheet/Safety Data Sheet guidance documents where available.5.5 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted andReportable Substances for Parts.6 Approved SourcesMaterials supplied to this specification must be approved by General Motors.A
23、list of approved materials can be found in MATSPC. This GM Material File is provided to third parties toreduce redundant testing of materials. If approved material already listed is used, the part supplier can use GMMaterial File reference for Production Part Approval Process (PPAP) material approva
24、l. If the decision is madeto use a not yet approved material, contact GM Materials Engineering for details on the approval process. Thematerial approval process must be completed prior to PPAP start date of the part supplied to General Motors.7 Notes7.1 Glossary.MATSPC: Global repository of GM appro
25、ved materials for corresponding GM Engineering Standards.7.2 Acronyms, Abbreviations, and Symbols.GHS Globally Harmonized System of Classification and Labeling of ChemicalsMSDS Material Safety Data SheetPPAP Production Part Approval ProcessSDS Safety Data SheetVOC Volatile Organic CompoundSVOC Semi-
26、Volatile Organic CompoundCopyright 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 GMW16938 Copyright 2013 General Motors Company All Rights ReservedM
27、arch 2013 Page 4 of 48 Coding SystemThis standard shall be referenced in other documents, drawings, etc., as follows:Material per GMW16938P-TXWhere:X = Type9 Release and RevisionsThis standard was originated in March 2013. It was first approved by Plastics Global Subsystem LeadershipTeam in March 2013. It was first published in March 2013.Issue Publication Date Description (Organization)1 MAR 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-,-,-
