GMNA-GMP.PVC.034-2007.pdf
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1、 ENGINEERING STANDARDS Material Specification Plastics GMP.PVC.034 PVC 78 Shore D, Weatherable, Integral Colored, Rigid Extrusion Molding Compound Copyright 2007 General Motors Corporation All Rights Reserved November 2007 Originating Department: North American Engineering Standards Page 1 of 3 1 Sc
2、ope This specification covers the properties of an integrally colored, weather resistant, flexible, Shore D 78 3 hardness, poly(vinyl chloride) homopolymer, pellet form, rigid extrusion molding compound. Note: The specification does not include color, gloss or finish requirements. Those requirements
3、 will be indicated on the engineering drawing. 1.1 Material Description. Not applicable. 1.2 Symbol. The material abbreviation according to ISO 11469 is PVC. 1.3 Typical Application. Typical applications include the following: coextruded door guards. 1.4 Remarks. Not applicable. 2 References Note: O
4、nly the latest approved standards are applicable unless otherwise specified. 2.1 External Standards/Specifications. ASTM D256 ASTM D2240 ASTM D638 ISO 11469 ASTM D648 SAE J1545 ASTM D790 SAE J1960 ASTM D792 SAE J1976 2.2 GM Standards/Specifications. GM9329P GMW3001 GM9735P GMW3059 3 Requirements 3.1
5、 Requirements on Delivery. Requirements on Test Specimens. Tests shall be conducted using the latest issue of the test methods indicated. Suitable precautions should be taken to ensure that applicable safe limits are not exceeded when conducting test procedures, processes, and/or handling the materi
6、als required by this specification. Tests shall be conducted 40 h minimum after molding and immediately following a conditioning period of 24 h minimum at 22 3C and 50 5% RH unless otherwise specified. All tests shall be performed on unannealed specimens. In addition, tests specified at temperatures
7、 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 extruded strips 25 mm wide by 3.2 0.2 mm thick unless otherwise specified. The minimum values specified in the property tables must
8、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 specified minimum value. 3.1.1 Chemica
9、l Requirements. All parts manufactured from molding compounds shall be resistant to the media they contact, such as aliphatic and aromatic hydrocarbons, fuels, lubricants, oils, greases and alcohols, at their places of use. 3.1.2 Mechanical Requirements. See Table 1. Table 1: Mechanical Requirements
10、 Mechanical Properties Test Methods Unit Value Shore D Hardness ASTM D2240. Use 1 kg mass. Specimen thickness, 6.4 20 mm. 15 s delay. Shore D 78 3 Copyright General Motors North America Provided by IHS under license with GM Licensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 06/23/200
11、8 23:28:54 MDTNo reproduction or networking permitted without license from IHS -,-,- GMP.PVC.034 GM ENGINEERING STANDARDS Copyright 2007 General Motors Corporation All Rights Reserved Page 2 of 3 November 2007 3.1.3 Physical Requirements. See Table 2. Table 2: Physical Requirements Physical Properti
12、es Test Methods Unit Value Specific Gravity ASTM D792 Submit at time of approval Tensile Strength ASTM D638, Type IV, 500 mm/minute MPa 40 minimum Flexural Modulus ASTM D790 Method I, 1.3 mm/minute, 50 mm span, tangent calculation MPa 2400 minimum Deflection Temperature Under Load ASTM D648, 1820 KP
13、a C 65C minimum High Temperature Humidity Resistance GM9329P No Objectionable Tackiness 3.1.4 Additional Requirements. See Table 3. For integrally colored compounds, the color of each test specimen shall be measured per SAE J1545, CIELAB color space, 10 degree observer, illuminant D65, specular incl
14、uded, sphere geometry, before and after exposure. In case of conflict between accelerated weathering and natural weathering, natural weathering takes precedence. Wash and polish weathered specimens prior to making measurements and observations. Wash, with scrubbing action, using a sponge that is sat
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