Hydroxypropyl methyl cellulose (HPMC) is a natural polymer cellulose as raw material, obtained by a series of chemical processing of non-ionic cellulose ether. They have: water-soluble, water retention, non-ionic stable, PH value, surface activity, temperature reversible gelling, thickening, adhesion, film forming, lubricity and anti-enzymes and other characteristics. Widely used for thickening, gelation, emulsification, dispersion stability, water retention, improve the workability and other occasions.