FRMASTER-50MB is mainly used in the fire-resistance for exterior insulation materials. Compared with the traditional HBCD flame retardant masterbatch, this FR masterbatch use the environment-friendly bromine & phosphorus-based composite flame retardant as the main material, use the PS as the carrier and compound with the flame retardant synergists, small molecule scavenger and macromolecular chain extender. The FR effect is more excellent than HBCD.