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\nPlastics – Determination of the Brittleness Temperature by Impact<\/p>\n
\n1 SCOPE<\/p>\n
This Standard specifies a method for determining the temperature at which plastics that are not rigid at normal ambient temperature exhibit brittle failure under specified impact conditions. Two test methods are specified depending on different test machines and specimens:
\n\uf02d A method: Type A test machine and Type A test specimen;
\n\uf02d B method: Type B test machine and Type B test specimen.
\nThis standard utilizes a statistical technique to obtain the brittleness temperature. Provisions are made for the testing of sufficient specimens to permit the calculation of the brittleness temperature on a statistical basis. Statistical techniques have been developed to quantify the brittleness temperature as is defined in 3.1.
\nThis standard establishes the temperature at which there is a 50% chance of failure in specimens. This standard is relatively useful for formulating material specifications, although it does not necessarily measure the lowest temperature at which the material may be used. The precision of the measurement shall not exceed \uf0b15\u00b0C when establishing material specifications.<\/p>\n
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.
\nGB\/T 2918-1998 Plastics–Standard atmospheres for conditioning and testing (ISO 291: 1997, IDT)
\nGB\/T 11547-2008 Plastic – Methods of test for the determination of the effects of immersion in liquid chemicals (ISO 175:1999, MOD)
\nASTM D746:2007 Standard Test Method for Brittleness Temperature of Plastics and Elastomers by Impact<\/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 5470-2008 \u82f1\u6587\u7248\/English … \u7ee7\u7eed\u9605\u8bfb