ChinaAutoRegs\uff5cGB\/T 7141-2008 \u82f1\u6587\u7248\/English\/\u7ffb\u8bd1\/\u5851\u6599\u70ed\u8001\u5316\u8bd5\u9a8c\u65b9\u6cd5
\nPlastics – Methods of Heat Aging<\/p>\n
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1 SCOPE<\/p>\n
1.1 This Standard defines the exposure conditions of plastics at various temperatures when exposed solely to hot air for extended periods of time. Only the procedures for heat exposure are specified, not the test method or specimen. The effect of heat on any particular property may be determined by selection of the appropriate test method and specimen; however, it is recommended that ASTM D3826 be used to determine the embrittlement endpoint, which is defined as that point in the history of a material when 75 % of the specimens tested have a tensile elongation at break of 5 % or less at an initial strain rate of 0.1 mm\/min.
\n1.2 This Standard is used as a guide for comparing the heat-aging characteristics of materials as measured by the change in some property of interest (that is, embrittlement by means of loss of elongation). This Standard is applicable for use in evaluating plastics designed to be oxidized easily after use.
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2 NORMATIVE REFERENCES<\/p>\n
The following standards contain provisions which through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments (corrigenda excluded) to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the Standards indicated below. For undated references, the latest edition of the applicable Standards referred to apply.<\/p>\n
GB\/T 2035 Terms and definitions for plastics (GB\/T 2035-2008, ISO 472:1999, IDT)
\nGB\/T 2918 Plastics – Standard atmospheres for conditioning and testing (GB\/T 2918-1998 idt ISO 291:1997)
\nGB\/T 7142 Determination of time-temperature limits for plastics after prolonged exposure to heat (GB\/T 7142-2002, ISO 2578: 1993, MOD)
\nGB\/T 11026.4-1999 Guide for the determination of thermal endurance properties of electrical insulating materials – Part 4: Ageing ovens – Single-chamber ovens (idt IEC 60216-4-1:1990)
\nISO 16014-2 Plastics – Determination of average molecular mass and molecular mass distribution of polymers using size-exclusion chromatography – Part 2: Universal calibration method
\nASTM D3826: 1998(2002) Standard Practice for Determining Degradation End Point in Degradable Polyethylene and Polypropylene Using a Tensile Test<\/p>\n
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\n\u4e13\u4e1a\u6e90\u4e8e\u4e13\u6ce8|ChinaAutoRegs \u59cb\u7ec8\u4e13\u6ce8\u4e8e\u673a\u52a8\u8f66\u6807\u51c6\u7ffb\u8bd1\uff01\u8fc4\u4eca\u4e3a\u6b62\u5df2\u7ffb\u8bd1\u4e0a\u5343\u4e2a\u56fd\u5185\u5916\u6c7d\u8f66\u6cd5\u89c4\u6807\u51c6\uff01\u72ec\u5bb6\u6253\u9020\u5343\u4e07\u7ea7\u6c7d\u8f66\u4e13\u4e1a\u672f\u8bed\u5e93\u548c\u8bb0\u5fc6\u5e93\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
ChinaAutoRegs\uff5cGB\/T 7141-2008 \u82f1\u6587\u7248\/English … \u7ee7\u7eed\u9605\u8bfb