电缆和光缆 非金属材料试验方法 第512部分：机械性能试验 聚乙烯和聚丙烯混合料专用试验方法　高温处理后抗张强度和断裂伸长率试验

Electric and optical fibre cables — Test methods for non-metallic materials — Part 512: Mechanical tests — Methods specific to polyethylene and polypropylene compounds — Tensile strength and elongation at break after conditioning at elevated temperature