How to tell if hydroxypropyl methyl cellulose ether is fake?

How to tell if hydroxypropyl methyl cellulose ether is fake?

1. The pure hydroxypropyl methyl cellulose HPMC looks fluffy and has a small bulk density, ranging from 0.3-0.4/ml; while the fake hydroxypropyl methyl cellulose has better fluidity and feels better It is heavy, which is significantly different from the original appearance.

2. The pure hydroxypropyl methyl cellulose aqueous solution is clear, has high light transmittance, and has a water retention rate of >97%; the HPMC aqueous solution of Shenhua is turbid, and the water retention rate is difficult to reach 80%.

3. Pure hydroxypropyl methylcellulose HPMC should not smell the smell of ammonia, starch and alcohol; the fake HPMC can usually smell all kinds of smells, even if it is tasteless, it will feel heavy.

4. The pure hydroxypropyl methylcellulose HPMC powder is fibrous under a microscope or magnifying glass; the pseudo-HPMC can be observed in granular solids or crystals under a microscope or magnifying glass.