A . common test methods for insulating and sheathing materials of electric cables - part 4 : methods specific to polyethylene and polypropylene compounds - section 2 : elongation at break after pre - conditioning - wrapping test after pre - conditioning - wrapping test after thermal ageing in air - measurement of mass increase - long - term stability test appendix a - test method for copper - catalysed oxidative degradation appendix b 电缆绝缘和铠装材料的通用试验方法.第4部分:聚乙烯与聚丙烯复合物专用方法.第2节:预处理后的断裂伸长率.预处理后的缠绕试验.空气中热老化后的缠绕试验.增加量的测量.长期稳定性试验
