4ZnO-B2O3-H2O (ZB411) is a kind of high heat resistant zinc borate compound with a higher initial dehydration temperature (> 410?). The ratio of zinc /boron is about 4:1, and the ZnO content is as high as 79%, ZB411 is widely used as flame retardants, smoke suppressants and vulcanization activator in plastics and rubber industries, especially recommended in polymer systems requiring very high processing temperatures.
When used in plastics, ZB411 can not only partially substitute the antimony trioxide but also have a synergistic effect with bromine flame retardants; In the application of glass fiber reinforced PA66 and PBT, ZB411 can improve the flame retardant performance, significantly reduce the cost and reduce combustion smoke generation; in rubbers, ZB411 can completely substitute ZnO and also partially substitute the Antimony trioxide, accelerating vulcanization and obtaining excellent flame retardant properties.