... borate 3.5H2OIntroduction:Zinc borate is primarily usedas a flame retardant in plastics and cellulose fibers, paper, rubbers and ... in paints, adhesives, and pigments. As a flame retardant, it can replace antimony trioxide as a synergist in both halogen-based and ... halogen-containing systems, zinc borate is used together with antimony trioxide and alumina trihydrate. It catalyzes formation of char and ...