Insulating and sheathing materials of electric and optical cables - common test methods - part 5 - 1 : methods specific to filling compounds - drop point - separation of oil - lower temperature brittleness - total acid number - absence of corrosive components - permittivity at 23 oc - d . c . resistivity at 23 oc and 100 oc 电缆和光缆的绝缘和护套材料.通用试验方法.第5 - 1部分:填充复合物的专用方法.滴点.油的分离.较低温脆性.总酸值.无腐蚀性成分. 23时的介电常数. 23和100的直流电阻率
