Hydroxypropyl methyl cellulose (HPMC) is the natural polymer materials cellulose as raw material, through a series of chemical processing made of non-ionic cellulose ether. They have: water-soluble, the water, non-ionic, PH value stability, surface activity, temperature reversible gel sex, thickening, adhesive, film sex, lubricity and resistance to mildew sexual features, for thickening, gelling change, emulsion, scattered stability, water and improve the workability, etc