... oxide in silicon steel grade, electrician grade, pharmaceutical grade, ect. b.Used as chemical reagent grade magnesium hydroxide,pharmaceutical grade magnesium ... .00Particle size D50 /um25-30 8-102-5 service:1,We have the "right to operate import and export" , and ... ,Do customized products and packaging according to customer requirements;5,We have good after-sale service to ensure the quality , ...