标准编号：ISO 7743:2008
中文名称：硫化橡胶或热塑性橡胶 压缩应变特性的测定
英文名称：Rubber, vulcanized or thermoplastic — Determination of compression stress-strain properties
发布日期：2008-05
标准范围
This International Standard specifies methods for the determination of the compression stress-strainproperties of vulcanized or thermoplastic rubber using a standard test piece, a product or a part of a product.Three methods are given:? using a standard test piece with the metal plates lubricated (method A);? using a standard test piece with the metal plates bonded to the test piece (method B);? using a product or a part of a product with the metal plates lubricated (method C).The three methods do not give the same results. With lubricated test pieces, the results are dependent onlyon the modulus of the rubber and are independent of the test piece shape, provided that complete slipconditions are achieved. Effective lubrication is sometimes difficult to achieve, however, and it is prudent toinspect the variance in the test results from replicate test pieces for indications of erratic slip conditions. Withbonded test pieces, the results are dependent on both the modulus of the rubber and the test piece shape.The dependence on test piece shape is strong and consequently the results will be markedly different fromthose obtained with lubricated test pieces. For products, the result is dependent on the shape, but as tests onproducts are mainly comparative this is acceptable.NOTE For well-specified product shapes, such as O-rings, the result may be correlated to the hardness value.Provision is made for the use of test pieces of different size and/or shape from the specified test piece, butextrapolation of the results obtained to other sizes and shapes may not be possible.Guidance on the effect of size and shape of test piece and of bonding or lubricating is given in Annex A.The methods are not suitable for materials that exhibit high set.The necessary calibration schedule for this type of measurement is included in Annex B.
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