A ; insulating and sheathing materials of electric and optical cables - common test methods - part 4 - 2 : methods specific to polyethylene and polypropylene compounds - tensile strength and elongation at break after conditioning at elevated temperature - wrapping test after conditioning at elevated temperature - wrapping test after thermal ageing in air - measurement of mass increase - long - term stability test - test method for copper - catalyzed oxidative degradation 电缆绝缘护套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翘曲试验在空气中热老化后的翘曲试验增加量测量长期稳定性试验
