Agent Name

Butylated hydroxytoluene

Alternative Name


CAS Number




Major Category

Other Uses


2,6-Di-tert-butyl-p-cresol; Ionol CP-antioxidant; 1-Hydroxy-4-methyl-2,6-di-tert-butylbenzene; 2,6-Bis(1,1-dimethylethyl)-4-methylphenol; 2,6-Di-t-butyl-4-methylphenol; 2,6-Di-t-butyl-p-cresol; 2,6-Di-terc.butyl-p-kresol [Czech]; 2,6-Di-tert-butyl-1-hydroxy-4-methylbenzene; 2,6-Di-tert-butyl-4-cresol; 2,6-Di-tert-butyl-4-hydroxytoluene; 2,6-Di-tert-butyl-4-methylhydroxybenzene; 2,6-Di-tert-butyl-4-methylphenol; 2,6-Di-tert-butyl-p-cresol; 2,6-Di-tert-butyl-p-methylphenol; 3,5-Di-tert-butyl-4-hydroxytoluene; 4-Hydroxy-3,5-di-tert-butyltoluene; 4-Methyl-2,6-di-terc. Butylfenol [Czech]; 4-Methyl-2,6-di-tert-butylphenol; 4-Methyl-2,6-tert-butylphenol; AO 29; AO 4; AO 4K; AOX 4; AOX 4K; Advastab 401; Agidol; Agidol 1; Alkofen BP; Antioxidant 264; Antioxidant 29; Antioxidant 30; Antioxidant 4; Antioxidant 4K; Antioxidant DBPC; Antioxidant KB; Antioxidant MPJ; Antioxidant T 501; Antox QT; Antrancine 8; BAT; BHT; BHT (food grade); BHT 264; BUKS; Butylated hydroxytoluene; Butylated hydroxytoluol; Butylhydroxytoluene; Butylohydroksytoluenu [Polish]; CAO 1; CAO 3; Catalin antioxydant 1; Catalin cao-3; Chemanox 11; DBPC; DBPC (technical grade); Dalpac; Deenax; Di-tert-butyl-p-cresol; Di-tert-butyl-p-cresol (VAN); Di-tert-butyl-p-methylphenol; Dibunol; Dibutylated hydroxytoluene; Impruvol; Ionol; Ionol (antioxidant); Ionol 1; Ionol CP; Ionole; Kerabit; Nocrac 200; Nonox TBC; P 21; P21; Parabar 441; Paranox 441; Phenol, 2,6-bis(1,1-dimethylethyl)-4-methyl-; Stavox; Sumilizer BHT; Sustane; Sustane BHT; Swanox BHT; Tenamen 3; Tenamene 3; Tenox BHT; Tonarol; Topanol; Topanol O; Topanol OC; Toxolan P; Vanlube PC; Vanlube PCX; Vianol; Vulkanox KB; o-Di-tert-butyl-p-methylphenol; [ChemIDplus]




White to pale-yellow, crystalline solid with a slight, phenolic odor; (food preservative); [NIOSH]


Used as an anti-oxidant in gasoline, oils, waxes, rubbers, paints, and plastics; purified forms are used as anti-oxidants in foods; [ACGIH] Used as an "anti-skinning agent in paints and inks"; [Merck Index] BHT is a preservative and anti-oxidant used in food, cosmetics, and medications. Industrial applications include: animal feeds, jet fuels, rubber, plastics, paints, and glues. [Marks, p. 138-9]


Permitted in food at levels up to 200 ppm; Despite its widespread use, BHT is a rare skin sensitizer; Percent positive patch test responses were 0.1% in a US series in 1992-4; Contact urticaria has been reported; [Marks, p. 138-9] May have effects on the liver; [ICSC]

Exposure Assessment
Skin Designation (ACGIH)

Insufficient data


2 mg/m3, inhalable fraction and vapor


10 mg/m3, inhalable fraction

Vapor Pressure

0.01 mm Hg

Explanatory Notes

Flash point = 260 deg F;

Flammability (NFPA)

1: Must be preheated

Adverse Effects
Skin Sensitizer



Hepatotoxin, Secondary

IARC Carcinogen

Not Classifiable

ACGIH Carcinogen

Not Classifiable

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information


Chemical Information

Search ChemIDplus

Biomedical References

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Related Information in HazMap

Occupational diseases associated with exposure to this agent:


Industrial Processes with risk of exposure: