4-tert-Butylcatechol. high efficient polymerization inhibitor of Olefin monomer, especially suitable for Styrene, butadiene, chloroprene and isoprene, and vinyl chloride monomer, etc, antioxidant of Ethylene, polypropylene, polychloroprene, nylon and synthetic rubber polymers and oils or their derivatives, ethyl cellulose, lubricants and metal soap, deactivator of carbamic acid ester catalysts, and stabilizer of organic compounds.