... as pharmaceutical auxiliary material.For HPMC, the special low viscosity like 3 cps,5cps,10cps,15cps is better ... the taste of tablets.Below is specification of HPMC low viscosity (E3, E5, E10,E15)3cps, 5cps, 10cps ... , 15cps.just difference between the viscosity. GradeE3E5E10E15Hydroxypropoxyl content:wt%7.0-12.07.0- ... propyl Methyl cellulose pharmaceutical USP grade (low viscosity E3 E5 E15)