Product name: zinc borate Equivalent name: chemtura zb-223; firebrake zb Cas no.: 1332-07-6;12767-90-7;138265-07-6 Zinc borate is one environmental-friendly halogen -free flame retardant.There are some Formulations of x zno. Yb2o3.Zh2o, in which zinc borate with 3 hydrate is called zb-223. It is an good flame retardant synergist and smoke suppressant in polymers to partially Replace antimony oxide, and can be used in certain applications as afterglow suppressant And antiarcing agent.Due to its high zinc content, it is mainly recommended for pvc, and also have applications in polyolefins, p47.21 B2o3% ......................................................... 38.74 Surface water %..................... .......................0.2 Particle size(um)........... ............................... 6.29 Max particle size(um):........................... ........ 49.74 Pb ppm..................... .. .......... ........................ 12.7 Cd ppm......................................................... 2.76