Patent ID: 6030543
Filing Date: 2000-02-29
Classification: C10M,C10N

Abstract:
An improved fire resistant hydraulic base fluid composition having a specific gravity of less than 1.03, and a four-ball wear scar of less than 0.9 mm, the improvement consisting essentially of 1 to 12 parts by weight of a trialkoxyalkyl phosphate ester, each alkoxyalkyl moiety containing about 6 to 10 carbon atoms, and 1 part by weight of an ester or a mixture of esters selected from the group consisting of a trialkyl ester of phosphoric acid and C4-C8 alkyl alcohols, a triaryl phosphate ester wherein the aryl groups are partially C3 to C4 alkylated phenols, and a trialkyl phosphite ester having a pour point of less than -50.degree. C., each alkyl group of the trialkyl phosphite ester containing from 8 to 12 carbon atoms.