ISO 812:2017规定了一种方法，用于确定橡胶材料不出现脆性破坏的最低温度，或在规定条件下受到冲击时，试验中使用的一半试件发生故障的温度。 由此确定的温度不一定与可使用材料的最低温度有关，因为脆性将受到试验条件，尤其是冲击速率的影响。因此，通过该方法获得的数据仅用于预测橡胶在低温下的性能，其变形条件与试验中规定的相似。 描述了三种程序: -程序A，确定脆性温度； -程序B，其中确定了50%失效的脆性温度； -程序C，其中试样在规定温度下受到冲击。 程序C用于橡胶材料的分类和规范目的。 注:ISO 4646中描述了橡胶涂层织物的类似试验。

ISO 812:2017 specifies a method for determining the lowest temperature at which rubber materials do not exhibit brittle failure or the temperature at which half of the test pieces used in a test fail when impacted under specified conditions. The temperatures thus determined do not necessarily relate to the lowest temperature at which the material can be used since the brittleness will be affected by the conditions of test and especially by the rate of impact. Data obtained by this method are, therefore, intended to be used to predict the behaviour of rubbers at low temperatures only in applications in which the conditions of deformation are similar to those specified in the test. Three procedures are described: - procedure A, in which the brittleness temperature is determined; - procedure B, in which the brittleness temperature for 50 % failure is determined; - procedure C, in which the test piece is impacted at a specified temperature. Procedure C is used in the classification of rubber materials and for specification purposes. NOTE A similar test for rubber-coated fabrics is described in ISO 4646.