A study on anti-oxidant used for fire-resistant oil has been carried out

and a comparison with other four anti-oxidants being made.Results show that the TKY7903 type anti-oxidant can effectively enhance the oxidation resistant ability of fire-resistan oil under high-temperature operation condition

and can restrain the deterioration process of the fire-resistant oil

having non-effect upon other performance indices of the oil quality.In the event of dosing TKY7930 anti-oxidant into the fire-resistant oil

the acid value of fire-resistant oil in operation to be smaller

the better effectiveness of anti-oxidation may have.The dosage of said anti-oxidant may consider 0.5%(mass percentage density) as suitable.