Grade AZO 77HSA is an extremely small particle size French Process, statistically controlled zinc oxide produced from zinc metal. AZO 77HSA was specifically developed for highest reactivity, viscosity, fineness, and purity. This grade is used in latex compounds, plastics, can sealants, paint/coating, zinc chemicals, and in the food can liner coating industry where the extremely fine particles readily convert certain available solubles into white sulfide, thus preventing discoloration of food from sulifides of iron or tin. Grade AZO 77HSA is available with surface treatment (AZO 77HSA-T).