Agent Name

Zinc bis(O,O-bis(1,3-dimethylbutyl) dithiophosphate)

CAS Number




Major Category



O,O-Bis(1,3-dimethylbutyl)dithiophosphate zinc salt; Zinc O,O,O',O'-tetrakis(1,3-dimethylbutyl) bis(phosphorodithioate); Zinc, bis(O,O-bis(1,3-dimethylbutyl) phosphorodithioato-S,S')-, (beta-4)-; Zinc, bis(O,O-bis(1,3-dimethylbutyl) phosphorodithioato-kappaS,kappaS')-, (T-4)-; Phosphorodithioic acid, O,O-bis(1,3-dimethylbutyl) ester, zinc salt; [ChemIDplus] ECA 8509; PARABAR 9419; [IUCLID] Zinc BDBP; 2-Pentanol, 4-methyl-, hydrogen phosphorodithioate, zinc salt; 4-Methyl-2-pentanol hydrogen phosphorodithioate zinc salt; Zinc O,O-di(1,3-dimethylbutyl)phosphorodithioate; Phosphorodithioic acid, O,O-bis(1,3-dimethylbutyl) ester, Zn salt; Zinc bis(1,3-dimethylbutyl) dithiophosphate; Zinc bis(1,3-dimethylbutyl)phosphorodithioate; Zinc O,O-bis(4-methyl-2-pentyl)phosphorodithioate; [ToxPlanet: Government of Canada]


Organic Compounds, Metal Salts


Liquid; [IUCLID] Amber viscous liquid; [EPA ChAMP: Initial Risk-Based Prioritization: Supporting Documents]


Used as multi-functional anti-wear agents and antioxidants for gasoline and diesel motor oils and industrial oils; [EPA ChAMP: Initial Risk-Based Prioritization: Supporting Documents]


Oral LD50 (rat) = 2,000-5,000 mg/kg; Causes skin and mild to moderate eye irritation in rabbits; Not a skin sensitizer in guinea pigs using the Buehler test; Skin necrosis and possible adverse effects on male reproductive system observed in 3-week dermal study of rabbits; [IUCLID] Members of the zinc dialkyldithiophosphates (ZDDP) category demonstrate low acute oral and dermal toxicity; Moderate systemic toxicity in repeated-dose oral and dermal studies; Moderate systemic toxicity in adults, moderate postnatal developmental toxicity, and no effects on reproductive parameters or reproductive organs in an oral combined reproductive/developmental study of rats; Moderate male reproductive organ toxicity in several repeated-dose dermal studies of rabbits; [EPA ChAMP: Initial Risk-Based Prioritization: Supporting Documents] See "Zinc dialkyldithiophosphates." See "Zinc."

Exposure Assessment

0.1 mg/m3(respirable fraction), 2 mg/m3 (inhalable fraction) for Zn inorg. cmpnds

Vapor Pressure

8.76E-8 mm Hg

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