1. HPMC has thermal gel properties.After the product aqueous solution is heated, it forms a gel and dissolves after cooling.Different specifications have different gel temperatures.The solubility varies with viscosity.The lower the viscosity, the greater the solubility.Different specifications of HPMC have certain differences in performance.HPMC is soluble in water and is not affected by pH 2. The gel temperature of 0.2% aqueous hydroxypropyl methylcellulose is 50 to 90°C. 3. Hydroxypropyl methylcellulose particle size: 100 mesh pass rate is greater than 98.5%.Bulk density: 0.25-0.70g / (usually 0.4g / s), specific gravity 1.26-1.31.Discoloration temperature: 180-200℃, carbonization temperature: 280-300℃.The methoxy value is in the range of 19.0% to 30.0%, and the hydroxypropyl value is in the range of 4% to 12%.Viscosity (22°C, 2%) 5 to 200,000 mPa.s. Gel temperature (0.2%) 50 to 90°C.