4-tert-Butylcatechol (TBC) is an organic chemical compound that is a derivative of catechol. It is added as a stabilizer and an inhibitor of polymerization to butadiene, styrene, vinyl acetate, and other reactive monomer streams. It is 25 times better than at 60°C for polymerization inhibitory effect. Also used as a stabilizer in the manufacture of polyurethane foam. It also can be used as an antioxidant for synthetic rubber, polymers, and oil derivatives. It can be used as a purification agent for aminoformate catalysts. TBC is available in a form of a solid crystal and 85% solution in water.