... )Two types:powder and ball3)Passes ISO9001:20082~4mmActivated Alumina Ball2~4mm Activated alumina ball has much micro-paths, so the specific surface ... strong for water, oxide, acetic acid, alkali etc. 2~4mm Activated alumina ball defluorinated just as the anion exchange resin, but the ... is stable, the absorbed fluorine is 6400g/cm3. It has high strength, low abrasion, no soften in water, no expansion, ...