Used as synthetic antioxidant.

In pesticides, 4-tert-butylphenol is used in the synthesis of the acaricide fenpropimorph, and is also the raw material for the new fungicide spiroxamine.

UV absorbers, pesticides, anti-cracking agents for rubber, coatings, antioxidants, dispersants, lubricants, detergents, combustion aids, styrene stabilizers, dyes and paint additives, and industrial insect repellents.