Agent Name

Di-tert-butyl peroxide

Alternative Name


CAS Number




Major Category

Other Classes


Bis(1,1-dimethylethyl)peroxide; Bis(t-butyl)peroxide; Bis(tert-butyl) peroxide; Cadox; Cadox TBP; DTBP; Di-t-butyl peroxide; Di-tert-Butyl hydroperoxide; Di-tert-butyl peroxyde [Dutch]; Di-tert-butylperoxid [German]; Interox DTB; Kayabutyl D; Perbutyl D; Perossido di butile terziario [Italian]; Peroxide, bis(1,1-dimethylethyl); Peroxyde de butyle tertiaire [French]; Trigonox B; t-Butyl peroxide; tert-Butyl peroxide; [ChemIDplus] UN3107


Peroxides, Organic


Clear, water-white or yellow liquid; Insoluble in water; [HSDB] Faintly yellow clear liquid; Insoluble in water; [MSDSonline]


Used as an initiator for high-temperature, high-pressure polymerizations of ethylene and halogenated ethylenes; in the synthesis of polyketones; as a finishing catalyst for polystyrene; as a polymerization catalyst for acrylonitrile polymers and resins (including olefins, styrene, styrenated alkyds, and silicones); as curing agent for styrenated alkyds and silicone rubbers; as ignition accelerator for diesel fuels; and as a cross-linking agent (rubber and resins); [HSDB]


Caused muscle weakness and ataxia after intraperitoneal lethal-dose studies of rats; Mild irritant effect when administered into eyes of rabbits; [RTECS] Fire hazard; Strong oxidizer; [Hawley] A skin and mucous membrane irritant; Corrosive to eyes; [HSDB] An eye and respiratory tract irritant; [ICSC] May cause irritation; [MSDSonline]

Exposure Assessment
Vapor Pressure

25.1 mm Hg

Lethal Concentration

LC50 (rat) > 4,100 ppm/4h

Explanatory Notes

The Guide in the Emergency Response Guidebook is for "Oragnic peroxide type E, liquid."

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information


Chemical Information

Search ChemIDplus

Related Information in HazMap

Industrial Processes with risk of exposure: