Brominated Epoxy Resin (Tetrabromobisphenol A Diglycidyl Ether)

Brominated Epoxy Resin (TBBPA-DGE, CAS 26265-08-7) is the diglycidyl ether of tetrabromobisphenol A, containing approximately 48-50 wt% bromine. This reactive flame retardant epoxy resin is the standard component for achieving UL94 V-0 flame retardancy in epoxy laminate systems, particularly FR4 printed circuit board base materials (IPC-4101 specification), halogenated flame retardant epoxy composites, and electrical encapsulation requiring UL94 V-0 classification.

In FR4 PCB laminates, brominated epoxy is blended with standard BPA epoxy at 25-40% loading to achieve the bromine content (18-21 wt% in cured laminate) required for UL94 V-0 classification. The EEW of 340-380 g/eq reflects the molecular weight contribution of the four bromine atoms. The resin is compatible with DICY/accelerator cure systems standard in FR4 manufacturing and produces laminates meeting IPC-4101C Class B/L specifications for glass-reinforced epoxy laminates.

Beyond PCB applications, brominated epoxy is used in transformer potting compounds requiring UL94 V-0, flame-retardant composite structures (mass transportation, building panels), and halogenated epoxy adhesives for fire-rated assemblies. The reactive nature of the flame retardant (covalently incorporated versus additive FR) ensures permanent flame retardancy not subject to migration or extraction.