GB/T 2951.9-1997 电缆绝缘和护套材料通用试验方法　第4部分：聚乙烯和聚丙烯混合料专用试验方法　第2节：预处理后断裂伸长率试验——预处理后卷绕试验——空气热老化后的卷绕试验——测定质量的增加　附录A：长期热稳定性试验　附录B

GB/T 2951.9-1997 Common test methods for insulating and sheathing materials of electric cables Part 4:Methods specific to polyethylene and polypropylene compounds Section two:Elongation at break after pre-conditioning—Wraping 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)