Appearance: White or almost white fibrous or granular powder
Stability: Solids are flammable and incompatible with strong oxidizing agents.
Particle size; 100 mesh pass rate greater than 98.5%; The pass rate of 80 mesh is 100%. Special specifications with a particle size of 40-60 mesh.
Carbonization temperature: 280-300 ℃
Apparent density: 0.25-0.70g/cm3 (usually around 0.5g/cm3), specific gravity 1.26-1.31.
Color change temperature: 190-200 ℃
Surface tension: 42-56dyne/cm in 2% aqueous solution
Solubility: Soluble in water and some solvents, such as appropriate proportions of ethanol/water, propanol/water, etc. Aqueous solutions have surface activity. High transparency and stable performance. The gel temperature of products of different specifications is different, and the solubility changes with viscosity. The lower the viscosity, the greater the solubility. The performance of HPMC of different specifications is different, and the dissolution of HPMC in water is not affected by pH value.
With the decrease of methoxy content, the increase of gel point, the decrease of water solubility and the decrease of surface activity of HPMC.
HPMC also has thickening ability, low salt resistance, pH stability, water retention, dimensional stability, excellent film forming ability, as well as extensive enzyme resistance, dispersibility, and adhesion.
