Chemical name：Calcium bis[monoethyl(3,5-di-tert-butyl-4-hydroxylbenzyl)phosphonate] 50% + 4,4’-Thiobis(2-t-butyl-5-methylphenol) 50% CAS No.:65140-91-2 & 96-69-5 Molecular weight: 695g/mol, 358g/mol  Molecular structure:     Appearance: White, free flowing powder Odor: Odorlesss                                                          ANTIOXIDANT HONOX-B551 is an associative antioxidant which include 50% antioxidant 300 and 50% antioxidant 1425. It is an esterification catalyst and bleaching agent system with antioxidant properties. When Antioxidant 300 is used with Antioxidant 1425, it would have been an excellent complement in performance. It offers accelerated reaction times and produces a resin with reduced color and low acid numbers. It is approved in many countries for use in food contact applications. info at hhochem. com