Insulating and sheathing materials of electric and optical cables - common test methods - part 3 - 1 : methods sp cific to pvc compounds - pressure test at high temperature - tests for resistance to cracking 电缆和光缆绝缘和护套材料.通用试验方法.第3 - 1部分: pvc化合物专用法.高温压力试验.耐断裂试验