... drilling,paint,chemical etc. 2.High qulity of bentonite 3.Manufacturer of bentonite powder--hot-sale 1.Introduction:Shijiazhuang Oushun Minerals ... etc.Our bentonite drilling with sodium, calcium bentonite strict implementation of the Chinese National Standards, has a good suspension,thixotropy ... stored in ventilated, cool and dry place.5.Photo: Bentonite of Oil Drilling--hot-sale,high quality