1、WORLDWIDEENGINEERINGSTANDARDSMaterial Specification GMW8751Polyamide 66 - Mineral/Glass Fiber Reinforced, Heat Stabilized Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Originating Department: GME Specification Center Page 1 of 41 Scope1.1 Material Description. This standard d
2、escribes material types of mineral/glass fiber reinforced, heatstabilized polyamide 66 (nylon 66) which are used in injected form for molded components.1.2 Symbols. The material abbreviations according to ISO 11469 are shown in Table 1.1.3 Typical Applications. Cover Cylinder Head, engine covers.1.4
3、 Remarks. The classification into groups is according to the different ranges of mineral/glass fiber content.2 ReferencesNote: Only the latest approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.ASTM D6869 ISO 294 ISO 1874-2 ISO 11469ISO 75-2 ISO 527-1
4、ISO 3146 ISO 15512ISO 179 ISO 527-2 ISO 3167ISO 188 ISO 1183 ISO 34512.2 GM Standards/Specifications.GMW3013 GMW3059 GMW3221 GMW143352.3 Additional References.TMC003 Material Safety Data Sheet guidance documents (available at ).3 RequirementsMaterials approved to this standard shall meet the require
5、ments of GMW3013, General Requirements forHandling of Technical Terms of Delivery for Plastics.3.1 Requirements on Delivery. Important physical, mechanical and thermal properties that characterize thematerial are summarized in Table 1.The color shall be specified on drawings, in material specificati
6、ons and otherwise.3.2 Requirements on Test Specimens. Unless otherwise specified, injection molding of test specimens shallbe accomplished per ISO 294 with the conditions for injection molding from ISO 1874-2. Test methods andspecimen dimensions are also to be in accordance with ISO 1874-2 with the
7、following additions: use ISO 3167,Type A, thickness 4 mm, for tensile and flexural properties.Test values indicated in Table 1 are based on material with moisture content of 0.2 % maximum (dry asmolded) as tested per ASTM D6869, GMW14335, or ISO 15512, Method A or B. Immediately after molding, asper
8、 ISO 1874-2, specimens shall be sealed in moisture-proof containers and stored at (+22 3) C for24 h minimum. All tests shall be performed on unannealed specimens immediately after their removal from thecontainers in a controlled atmosphere per GMW3221, Code A, unless otherwise specified. In addition
9、, testsspecified at temperatures below or above (+22 3) C shall be conducted at the specified temperature usingspecimens conditioned at the specified temperature for 4 h minimum.The values specified in Table 1 shall be met by test specimens in natural, black or in a “standard” sampledcolor if natura
10、l or black are not available.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 GMW8751 Copyright 2012 General Motors Company All Rights Reserv
11、edOctober 2012 Page 2 of 43.3 Requirements on Parts. Parts of this material type shall have a water content, when tested perGMW14335, at delivery of at leastx 1.5 % by mass for material types reinforced up to 20 % by massx 1.0% by mass for material types reinforced over 20 % by massDeviations from t
12、his shall be specifically indicated on the part drawings.3.4 Chemical Requirements. All parts manufactured from molding compounds shall be resistant to the mediathey contact, such as aliphatic and aromatic hydrocarbons, fuels, lubricants, oils, greases and alcohols, at theirplaces of use.3.5 Compoun
13、d Properties (Natural and Black). See Table 1. The following are also required for full standardapproval. The minimum number of lots per test required is one in natural: Poissons Ratio, Stress Strain Curveat multiple temperatures (for example -30 C, +23 C, +85 C), Coefficient of Linear Thermal Expan
14、sion(CLTE), Mold Shrinkage and Fogging. See GMW3013 for all test procedures and parameters.3.6 Performance Requirements. Performance Requirements e.g., flammability, fogging or resistance to odorshall be specified on part drawings or in component specifications.Table 1: Compound Properties (Natural
15、and Black)Property Note 1 Standard UnitM15-GF15 M15-GF25 M20-GF10 M30-GF10Range Range Range RangeISO Symbol PA66-(MD15+GF15)PA66-(MD15+GF25)PA66-(MD20+GF10)PA66-(MD30+GF10) 90 145 115 105Stress atBreak at+22 C afterHeat AgingNote 2ISO 527-1ISO 527-2 % Retention 75Strain atBreakISO 527-1ISO 527-2 % 2
16、 1.9 3 2CharpyImpactStrengthISO 179/1eUat +22 C kJ/m2 45 34 40 25at -30 C kJ/m2 35 30 35 20CharpyNotchedImpactStrengthISO 179/1eAat +22 C kJ/m2 3 3 4 2at -30 C kJ/m2 3 2 3 1Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or netw
17、orking permitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW8751 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 3 of 4Property Note 1 Standard UnitM15-GF15 M15-GF25 M20-GF10 M30-GF10Range Range Range RangeCharpyNotchedImpactStrength at+22 C afterHe
18、at AgingNote 2ISO 179/1eA % Retention 75MeltingTemperatureISO 3146Method C orA (10K/minute)C Target Range+250 to +270HeatDeflectionTemperatureunder Load,1.8 MPaISO 75-2 C +170 +215 +220 +220Note 1: These values shall be determined in dry as molded condition. The mechanical properties of types condit
19、ioned to equilibrium atroom temperature and 50 % relative humidity have significantly altered values.Note 2: Heat aging for (1000 5) h at (+140 5) C according to ISO 188 Method A (air oven method). Charpy impact specimens shall benotched prior to aging.4 Manufacturing ProcessNot applicable.5 Rules a
20、nd Regulations5.1 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 Rejectio
21、n. Samples of components 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 fo
22、r any changes, e.g., 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,
23、 and toinclude 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 the supplier prior tocommencement of delivery of non-conforming bulk supplies. In individual cases, a shorter
24、test can be agreedto between the responsible Engineering department and the supplier.5.4 Initial Source Approval. No shipments shall be made by any supplier until representative initial productionsamples have been approved by the appropriate Materials Engineering department(s) as meeting therequirem
25、ents of this specification.5.5 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 Sheet must be submitted in compliance with
26、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 Safety Data Sheet/Safety Data Sheet guidanc
27、e documents where available.5.6 All materials supplied to this standard must comply with the requirements of GMW3059, Restricted andReportable Substances for Parts.Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking pe
28、rmitted without license from IHS-,-,-GM WORLDWIDE ENGINEERING STANDARDS GMW8751 Copyright 2012 General Motors Company All Rights ReservedOctober 2012 Page 4 of 46 Approved SourcesEngineering qualifications of an approved source are required for this standard. Only sources listed in the GMMaterials F
29、ile (MATSPC) under this standard number have been qualified by Engineering as meeting therequirements of this standard.7 Notes7.1 Glossary.MATSPC: Global repository of GM Approved Materials for corresponding GM Engineering Standards.7.2 Acronyms, Abbreviations, and Symbols.CLTE Coefficient of Linear
30、 Thermal ExpansionGHS Globally Harmonized System of Classification and Labeling of ChemicalsMSDS Material Safety Data SheetSDS Safety Data Sheet8 Coding SystemThis standard shall be referenced in other documents, drawings, etc., as follows:Glass/Mineral Filled, Heat Stabilized Polyamide 66 per GMW87
31、51P-PA66-(MDXX+GFYY)Where:GMW8751 = Document Identification NumberP = Material type, P=PlasticPA66 = Material categoryMDXX = Mineral content by massGFYY = Glass fiber content by massExample: GMW8751P-PA66-(MD20+GF10) is a heat stabilized polyamide 66 with 20 % mineral and 10 %glass fiber reinforceme
32、nt.9 Release and RevisionsThis standard was originated in September 2003. It was first approved by Global Plastics Team in September2003. It was first published in October 2003.Issue Publication Date Description (Organization)1 OCT 2003 Initial publication.2 SEP 2010 5 Year Refresh of document inser
33、ted into new template; Complete revision toremove the following code letters: Elastomer Modified (E), Flame Retardant (F),Exterior Weatherable (L), Reduced Moisture 0.15% (M), Polymer Modified (P),Interior UV Stabilized (U), Hydrolysis Resistant (W); Combined Tables 1 and 2,Removed Mean Values, Remo
34、ved Table 3, Removed Flexural Modulus (GlobalPlastic SSLT)3 OCT 2012 Paragraph 1.2 “engine covers” addedTable 1: Column “M15-GF15” addedParagraph 8 updated(Global Plastic SSLT)Copyright General Motors Company Provided by IHS under license with General Motors CompanyNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
