1,1,1-Tris(4-hydroxyphenyl)ethane

1,1,1-Tris(4-hydroxyphenyl)ethane (CAS 27955-94-8, EC 405-800-7) is a trisphenol monomer commercially known as TrisP-HAP or BIP-PHAP. It carries three reactive phenolic hydroxyl groups on a single ethane core, giving it a trifunctional architecture not found in standard bisphenols. No E-code is assigned.

In epoxy and phenolic resin systems, the three hydroxyl groups act as crosslinking nodes, increasing network density and raising glass transition temperatures compared to difunctional alternatives. It also functions as a chain-terminating antioxidant in polyolefin and rubber compounding, interrupting peroxy radical propagation during thermal processing and service life.

The material is supplied as a powder or crystalline solid, registered under REACH (EC 405-800-7), and classified under HS code 2907290030 for customs purposes. Standard packaging follows industrial drum formats; technical-grade material is available for polymer and coatings applications. Buyers should confirm lot-specific purity documentation prior to formulation use.