Common test methods for insulating and sheathing materials of electric cables . part 2 : methods specific to elastomeric compounds . section one : ozone resistance test - hot set test - mineral oil immersion test 电缆绝缘和护套材料通用试验方法第2部分:弹性体混合料专用试验方法第1节:耐臭氧试验-热延伸试验-浸矿物油试验