FIELD: chemistry.
SUBSTANCE: hydraulic fluid composition contains from approximately 50% to approximately 80% tri(n-butyl)phosphate, from approximately 5% to approximately 15% triarylphosphate or alkyl-substituted triarylphosphate and optionally up to approximately 20% tri(iso-butyl)phosphate.
EFFECT: disclosed compositions provide high flash-point and longer effective service life.
12 cl, 2 tbl, 1 ex
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