2,2,3,3-Tetrafluoropropan-1-ol

2,2,3,3-Tetrafluoropropan-1-ol (CAS 76-37-9) is a fluorinated alcohol used as the carrier solvent in CarPro FlyBy Forte at 80–85% by weight. It serves the same volatile-carrier role that ethanol plays in FlyBy30 — disperse the silane active, flash off during cure, leave the bonded silane network on the glass.

The fluorine substitution sets it apart from ordinary alcohol carriers in two ways. First, under the OECD 2021 PFAS structural definition — "any substance containing at least one fully fluorinated methyl or methylene carbon atom" — the –CF2–CF2– backbone qualifies it as PFAS. It is a short-chain fluorinated solvent, not a long-chain perfluoroalkyl surfactant like PFOA, so the bioaccumulation and persistence profile is materially milder than the perfluorinated C8 chains found in classical fluoroalkylsilane coatings. But the C–F bonds still resist standard hydrolysis and microbial degradation. Second, the SDS classifies it as Acute Tox. 4 inhalation (H332) with a vapor ATE of 11 mg/L — the inhalation hazard for FlyBy Forte during application is driven primarily by this carrier, not by the silane actives at 1–3%.