Abrasion resistant granular sodium perbor- - ate tetrahydrate of low bulk density

摘要

Water is added to, and continuously mixed with, dissolved sodium perborate tetrahydrate, whilst cooling, and then the product is allowed to crystallise completely and rapidly (pref. max. time is 30 mins.), is dried and opt. formed into a final product. Drying is pref. at 40-60 degrees C.