Montomorillonite for Medicine Grade (HPM-95/98) Montmorillonite1.HPM-98 is a refined high purity calcium montmorillonite for making medicine, and in white or off-white color , and in 325 mesh fine powder and odorless, and have a high permanent negative charge on its structure surface.2.It contains Ca-montmorillonite 98%, SiO2 56-58% and Al2O315-16% in chemical composition.3.The pharmacological ...