Tbpa can also be prepared by the reaction of phthalic anhydride and bromine in a mixture of concentrated sulfuric acid and 70% hydrogen peroxide in the presence of iodine, or in chlorosulfonic acid containing sulfur. tbpa is mainly used as a flame retardant in plastics, paper, and resin. Fire performance of cable sheaths cables can be supplied with special flame retardant pvc oversheaths to comply with the iec 332-1 standard. we can also supply cables with low smoke halogen free (lshf) sheaths according to bs 7211, bs 6724, or other equivalent international standards. quality assured Modern eastern is the middle east's trusted source for industrial supplies and safety products. for over 15 years, we have built a tradition of serving businesses, big and small, with effortless ways to get the products and services they need. Wego chemical group is a global importer, supplier and distributor of flame retardant chemicals. wego has established long-standing partnerships with manufacturers of products with applications and uses in the flame retardants industry. our strong worldwide network establishes wego as a premier supplier for flame retardant products around the world.