Arihant Trading Co. Supplies Hydroxypropyl Methyl Cellulose Phthalate. Arihant Trading Co. Offers specialty chemicals. Hydroxypropyl Methyl Cellulose Phthalate is a phthalic half ester of Hpmc which is exclusively used as a solvent based enteric coating agent in solid dosages due to its resistance to dissolution in simulated gastric fluids. The threshold ph value Hydroxypropyl Methyl Cellulose Phthalate is used for rapid disintegration or dissolution ph of hpmcp can be controlled by varying the phthalyl content. It is also called as HPMCP [HYPROMELLOSE PHTHALATE]