BS ISO 974-2000 塑料.用冲击法测定脆性温度

标准号：BS ISO 974-2000
中文标准名称：塑料.用冲击法测定脆性温度
英文标准名称：Plastics - Determination of the brittleness temperature by impact
标准类型：G31
发布日期：2000/5/15 12:00:00
实施日期：2000/5/15 12:00:00
中国标准分类号：G31
国际标准分类号：83.080.01
适用范围：This International Standard specifies a method for the determination of the temperature at which plastics that are not rigid at normal ambient temperature exhibit brittle failure under specified impact conditions. A supplementary technique using notched specimens develops brittleness values at a much higher temperature than are observed for unnotched specimens of the same plastic material. The method utilizes a statistical technique to quantify the brittleness failure 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. The method establishes the temperature at which there is a 50 % chance of failure in either unnotched or notched specimens. This method has been found useful for specification purposes, although it does not necessarily measure the lowest temperature at which the material may be used. In the measurement of the brittleness temperature, the precision of the measurement should preferably be ±5 ℃ at the worst when establishing values used in material specifications.