Hydrocarbons, C4, 1,3-butadiene-free, polymerized, triisobutylene fraction, hydrogenated

This hydrogenated C4 hydrocarbon polymer (CAS 93685-81-5) is a low-molecular-weight polyisobutylene-type resin used as the primary film-forming constituent in petroleum-based tire coatings. The "1,3-butadiene-free" qualifier confirms that the carcinogenic diene (butadiene) has been removed during polymerization — this is a safety-grade specification important for regulatory compliance. At 25–50% in the Gtechniq T1 formula, this polymer forms the durable, flexible coating film that bonds to tire rubber sidewalls. After application, the lighter carrier solvents evaporate and the polymer network cures via physical entanglement and adhesion to the rubber surface. The hydrogenation step ensures the polymer backbone is saturated, improving UV stability and oxidation resistance. The H226 classification (Flammable Liquid Category 3, flash point 28°C) means the mixture is classified as a flammable liquid — a material-handling consideration that does not affect health risk from normal topical use. The H304 aspiration hazard applies only if swallowed; there is no dermal or inhalation pathway to aspiration toxicity. The Aquatic Chronic 4 classification (H413) reflects the expected slow biodegradation of this hydrocarbon polymer class.