Testing of insulating materials; methods of test for the determination of ionic impurities in electrical insulating materials by extraction with liquids; identical with IEC 60589:1977 (status as of 1978)
绝缘材料的测试;用液体萃取法测定电绝缘材料中离子杂质的试验方法;与IEC 60589:1977相同(自1978年起的状态)