This is blended with selected base oils to assist in rapid heat dissipation. The base oils must have the property of low volatility, high flash point and improved degree of oxidation stability so that the rate of heat dissipation is not impaired mainly on account of loss of lighter fractions.


  • This oil is employed for the heat treatment of metals as quenching media to acquire correct tempering of high Carbon Steel tools and other accessories.


  • Good oxidation stability.
  • Good thermal stability.

Performance Standards

ISO-VG  32

Typical Key Properties

PSO Quenching Oil NO. 10 ISO VG 32
Kinematic Viscosity @40°C, cSt  32
100°C  cSt ASTM D445 5.31
Viscosity Index (ASTM D-2270) 96
Flash Point, (C0C), °C ASTM D-92 190
Pour Point, °C ASTM D97 -6

These typical characters tics are of existing production. Concurrently future production will conform to PSO specification variations in these characteristics may occur.