... :Zinc borate is primarily usedas a flame retardant in plastics and cellulose fibers, paper, rubbers and ... and char-promoting agent, and suppresses the afterglow. In electrical insulator plastics it suppresses arcing and tracking ... creates a protective layer of glass. Zinc catalyzes the release of halogens by forming zinc halides and ... for rubber, plastic, wood, paper, firefihgt, fiber, anti corrosive ...