How to distinguish the quality of HPMC
▲ Hydroxypropyl methylcellulose (HPMC) is a white powder. When fully dissolved in water, hydroxypropyl methylcellulose will form a transparent and viscous colloid.
▲ The main raw materials of HPMC: refined cotton, methyl chloride, and propylene oxide.
▲How to distinguish the advantages and disadvantages of hydroxypropyl methylcellulose?
1. Whiteness
Although whiteness does not determine whether HPMC is easy to use, and if whitening agents are added during the production process, it will affect its quality. However, most good products have good whiteness.
2. Fineness
The fineness of HPMC is generally 80 mesh and 100 mesh. The finer the finer, the better.
3. Transparency
Put hydroxypropyl methylcellulose (HPMC) into water to form a transparent colloid and look at its light transmittance. The greater the light transmittance, the better, which means there are fewer insoluble substances inside. The permeability of vertical reactors is generally good, while that of horizontal reactors is worse.
4. Proportion
The greater the specific gravity, the heavier the better. The specific gravity is generally due to the high hydroxypropyl content in it. The higher the hydroxypropyl content, the better the water retention.