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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.PVC.042 PVC UV Stabilized, Heat Stabilized, Castable Powder 1 Scope. This specification covers the properties of an inte- grally colored, ultraviolet light stabilized, heat stabi- lized, flexible polyvinyl chloride powder compound. 1.1 Mater
2、ial Description. Additional characteristics that apply to this specification are: Properties Code Letter Ultraviolet Light Stabilized U 1.2 Symbol. The material abbreviation according to ISO 11469 is: PVC 1.3 Typical Application. Typical applications in- clude the following: powder, slush or rotocas
3、t molded vinyl skins for instrument panel, door panel, console, airbag door and all applicable interior parts. 2 References Note: Only the latest approved standards are appli- cable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D412 ASTM D2240 ASTM D638 ISO 11469 ASTM D792
4、SAE J1545 ASTM D1004 SAE J1885 2.2 GM Standards/Specifications. GM9503P GMW3059 GM9538P GMW3221 GMW3001 GMW3417 3 Requirements 3.1 Requirements on Delivery. Tests shall be con- ducted using the latest issue of the test methods indicated. Suitable precautions should be taken to ensure that applicable
5、 safe limits are not exceeded when conducting test procedures, processes, and/or handling the materials required by this specification. Tests shall be conducted 40 h minimum after mold- ing and immediately following a conditioning period of 24 h minimum per GMW3221, Code A unless otherwise specified
6、. All tests shall be performed on unannealed specimens. In addition, tests specified at temperatures below or above 22 3C shall be conducted at the specified temperature using specimens conditioned at the specified temperature for 4 h minimum. Test specimens shall be die cut from test plaques prepar
7、ed by completely fusing liquid or powder PVC in an oven on a smooth, flat panel. Test specimens shall be 1.0 0.1 mm thick unless otherwise speci- fied. Property values are the average of an equal number of specimens cut from both the longitudinal and transverse plaque directions. The minimum values
8、specified in the property tables must be met by test specimens in natural, black or in a standard sampled color if natural or black are not available. For colored grades where other pigment and additive systems (e.g. stabilizer) are used, the impact values shall not decrease more than 10% from the s
9、pecified minimum value. 3.1.1 Chemical Requirements. All parts manufac- tured from molding compounds shall be resistant to the media they contact, such as aliphatic and aro- matic hydrocarbons, fuels, lubricants, oils, greases and alcohols, at their places of use. Copyright 2004 General Motors Corpo
10、ration All Rights Reserved October 2004 Originating Department: North American Engineering Standards Page 1 of 3 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:29:17 MDTNo reproduction or n
11、etworking permitted without license from IHS -,-,- GMP.PVC.042 GM ENGINEERING STANDARDS Copyright 2004 General Motors Corporation All Rights Reserved Page 2 of 3 October 2004 3.1.2 Mechanical Requirements. See table 1. Table 1: Mechanical Requirements Mechanical Properties Test Methods Unit Value Sh
12、ore A Hardness ASTM D2240 Use 1 kg mass. Specimen thickness, 6.4 2 mm. 15 s delay. Shore A68 to 80 Tensile Strength ASTM D412, Method A, Die C, 500 mm/minute or ASTM D638, Type IV, 500 mm/minute MPa 9 min Elongation at break ASTM D412, Method A, Die C, 500 mm/minute or ASTM D638, Type IV, 500 mm/min
13、ute MPa 250 min Tear resistance ASTM D1004 kN/m 25 min Mandrel Bend GM9503P, 30C, 12 mm diameter mandrel. (Note 1: Refer to the mandrel size selection chart below). No cracks Heat Aging Tensile Strength Elongation at Break Durometer Hardness Tear Resistance 168 h at 80C in an air-circulating oven fo
14、l- lowed by indicated property testing at 22C. Test methods are the same as for original mechanical property testing Change in property No objectionable color change or tackiness. 80% retention min 80% retention min Initial value 5 units max 80% retention min 3.1.3 Physical Requirements. See table 2
15、. Table 2: Physical Requirements Physical Properties Test Methods UnitValue Specific Gravity ASTM D792 1.13 to 1.25 3.1.4 Additional Requirements. See table 3. Table 3: Additional Requirements Properties Test Methods UnitValue Fogging Number GM9305P, Type A, 102 C % 60 min. No oily deposits For inte
16、grally colored compounds, the color of each test specimen shall be measured per SAE J1545, CIELAB color space, 10 degree ob- server, illuminant D65, specular included, sphere geometry, before and after exposure. In case of conflict between accelerated weathering and natural weathering, natural weath
17、ering takes precedence. Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:29:17 MDTNo reproduction or networking permitted without license from IHS -,-,- GM ENGINEERING STANDARDS GMP.PVC.042 C
18、opyright 2004 General Motors Corporation All Rights Reserved October 2004 Page 3 of 3 Table 4: Additional Performance Properties Properties Test Method Unit Value Ultraviolet Light Stabilized Interior Materials Accelerated Weathering Exposure to interior xenon arc apparatus per SAE J1885 at an irrad
19、iation of 1241 kJ/m2 . Exposure to Natural Weathering, per GM9538P, Temperature Normalized Radiation (TNR), refer- ence GMW3417 for the TNR calculation: 105 000 at 102C. Color Change After Xenon and/or Solar E 3.0 (for informa- tion only) Visual evaluation over- rides numerical scale approval. Surfa
20、ce Defects Visual No objectionable de- fects allowed Table 5: Mandrel Size Selection Chart Hardness Mandrel Size Hardness Mandrel Size 50 to 70 Shore A 6mm 37 to 49 Shore D 25 mm 71 to 95 Shore A 12 mm 50 to 70 Shore D 50 mm 3.2 Performance Requirements. Performance Requirements e.g., flammability,
21、fogging or resis- tance to odor shall be specified on part drawings or in component specifications. 4 Manufacturing Process. Not applicable. 5 Rules and Regulations 5.1 All materials supplied to this specification must comply with the requirements of GMW3001, Rules and Regulations for Material Speci
22、fications. 5.2 All materials supplied to this specification must comply with the requirements of GMW3059, Re- stricted and Reportable Substances for Parts. 6 Approved Sources Engineering qualification of an approved source is required for this specification. Only sources listed in the GM Materials F
23、ile (i.e., MATSPC) under this specification number have been qualified by engi- neering as meeting the requirements of this specifi- cation. 7 Coding System This material specification shall be referenced in other documents, drawings, VTS, CTS, etc. as fol- lows: GMP.PVC.042 8 Release and Revisions
24、8.1 Release. This specification was first approved and released in December 1999 from a 1990 pre- print. It was revised in 2004 and approved for publi- cation by the PVC Specialist Team. 8.2 Revisions. Rev Approval Date Description (Organization) A JUN 2000 Format Revision (GMNA) B OCT 2004 Change S
25、tress at Break to Ten- sile Strength and Strain at Break to Elongation at Break in Table 1. Change fogging tem- perature requirement from 85C to 102C. Add in solar TNR requirement, update procedure & nomenclature. Eliminate mul- tiple xenon requirements. (GMNA) Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/2008 23:29:17 MDTNo reproduction or networking permitted without license from IHS -,-,-
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