| 摘要 |
A fire-resistant hydraulic fluid comprises (a) a phosphate triester derived from phenol, alkyl-substituted phenol or an alkanol, provided that the carbon atom number ratio of the aliphatic groups to the total of the ester is less than 0.25, and (b) 0.5 to 10% by weight, based on the weight of the triester, of an aliphatic polyester derived from an alkanedibasic acid having 3 to 24 carbon atoms and an alkylene glycol having 2 to 10 carbon atoms, said polyester having a molecular weight of 5,000 to 50,000. The fluid has an improved fire resistance and a high viscosity index. |
