1. Gel temperature (0.2% solution) 50-90°C.
2. Soluble in water and most polar c and appropriate proportion of ethanol/water, propanol/water, dichloroethane, etc., insoluble in ether, acetone, absolute ethanol, and swell into clear or slightly turbid in cold water colloidal solution. The aqueous solution has surface activity, high transparency and stable performance.
3. HPMC has the property of thermal gelation. The product aqueous solution is heated to form a gel and precipitates, and then dissolves after cooling. The gelation temperature of different specifications is different. Solubility varies with viscosity. The lower the viscosity, the greater the solubility. Different specifications of HPMC have certain differences in their properties, and the dissolution of HPMC in water is not affected by the pH value.
4. Particle size: the passing rate of 100 mesh is greater than 98.5%. Bulk density: 0.25-0.70g/ (usually around 0.4g/), specific gravity 1.26-1.31. Discoloration temperature: 180-200°C, carbonization temperature: 280-300°C. The methoxyl value ranges from 19.0% to 30.0%, and the hydroxypropyl value ranges from 4% to 12%. Viscosity (22°C, 2%) 5～200000mPa .s. The gel temperature (0.2%) is 50-90°C.
5. HPMC has the characteristics of thickening ability, salt discharge, PH stability, water retention, dimensional stability, excellent film-forming property and wide range of enzyme resistance, dispersibility and cohesiveness.