Home / Standards / GB/T 12709-1991 GB/T 12709-1991 Active Lubricating oils--Determination of aging characteristics--Conradson carbon residue method 润滑油老化特性测定法 (康氏残炭法) Standard Type GBT ICS 75.100 CCS E30 Status 现行 Issue Date 1991-01-28 Implementation 1991-12-01 Responsible Dept 国家标准委 Drafting Unit N/A