... , expanding supending, fire-resistant, plasticity, lubricity etc. Drilling grade bentonite for drilling mud, whose quality meet international standards of OCMA and the ... of suspension in the drilling mud and also can increase the lubrication of drilling, clean the debris during drilling, as well as for ... bob at hnkingway dot comHenan Kingway Chemicals Co., Ltd. Drilling Mud API and OCMA Bentonite