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."

Flammability (NFPA)

2: High ambient temperature required

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: