Excellent resistance to oxidation and thermal changes allowing repeated quenchings owing to:- the use of solvent-refined base oils,- the presence of effective and durable antioxidant additives which give long bath life.- High flash point to ensure risk-free operation in the utilisation temperature range.- Low volatility limits evaporation loss and the formation of vapours and fumes.- Effective, durable cooling powers guarantee mechanical properties achieved after quenching (hardness, depth of hardness).- Low fluidity at the temperature of use reduces loss by entrainment, resulting in product savings.- Good antifoam properties which are essential on account of the high swirling of oil in the hardening tanks.