Tetrabromophthalic anhydride

Tetrabromophthalic anhydride (CAS 632-79-1), commonly abbreviated as TBPA and marketed under the trade name FireMaster PHT 4, is a reactive and additive bromine-based flame retardant.

Where is Tetrabromophthalic anhydride used?

• Electronics: incorporated into epoxy resins and printed circuit board laminates
• Polyester and polyurethane foam: reactive intermediate chemically bonding into the polymer backbone
• Textile and upholstery back-coating: TBPA-derived diols for fire safety regulations in commercial furnishings
• Transportation seating
• In rigid and flexible polymer systems it functions as both a processing additive and a reactive monomer.

Good to know: Its high bromine content makes it effective at meeting stringent flammability standards, allowing manufacturers to achieve UL 94 flame retardancy ratings. Reactive bonding into the polymer backbone helps reduce migration and improve durability of flame retardant performance.

Commercial specifications

• Purity specifications typically 98% or higher depending on specific industrial application requirements
• Packaging options commonly include 25 kg bags and bulk quantities suited to industrial procurement volumes