Boundary grade: barium sulfate (BaSO 4 ) 10% Industrial grade: barium sulfate (BaSO 4 ) 30% Available thickness: 0.25 m for the primary deposit and 1 m for the weathered clay deposit. Epp Packaging,Epp Packaging Box,Epp Packaging Foam,Epp Foam,EPP foam box Taizhou Tianma Plastic Products Co. LTD , https://www.tianmaepp.com