How to distinguish the quality of HPMC cellulose ?
In the building and construction industry , the hpmc cellulose
has a very important to use . The use of inferior products will cause slurry strength to become lower, cracking, hollowing and shedding, which greatly delays the quality of the project.
If you want to buy the Hydroxypropyl Methyl Cellulose (HPMC) , how to distinguish the advantages and disadvantages of hpmc ? we will tell you some ways.
The indirect differences,
Pure HPMC cellulose visual state fluffy, small volume density, 0.3 ~ 0.4 g/ml.
And the mixed cellulose has good fluidity and feel , it looks has obviously difference from the pure hpmc cellulose product.
The genuine product aqueous solution has high light transmittance and water retention rate up to 97%.
The Adulterated cellulose aqueous solution is cloudy , water retention rate is difficult to reach 80%.
3. The Odor:
The pure cellulose has no odor of ammonia, starch or alcohol .
The Adulterated products can smell all sorts of things, and even if they don't, they feel heavier.
4. The state:
Granular solids or crystals can be observed under a microscope or magnifying glass in the presence of HPMC.
Pure HPMC has fluffy visual state and small bulk density, ranging from 0.3 to 0.4 g/ml.
The adulterated HPMC has better fluidity and feel, which is obviously different from the genuine appearance.
2. Aqueous solution:
Pure products aqueous solution has high clarification and transmittance, and water retention rate is more than 97%.
The adulterated products aqueous solution is turbid and its water retention rate is difficult to reach 80%.
Pure products could not smell ammonia, starch and alcohol.
Adulterated products can smell all kinds of flavors, even if tasteless, it will feel heavier.
Pure products powder is fibrous under a microscope or magnifying glass.
Granular solids or crystals can be observed in adulterated HPMC under a microscope or magnifying glass.
1. The pure products have high whiteness
The whiteness cannot determine whether HPMC cellulose is suitable for use or not . If the manfuacture add the whitening agent in the production process , the product quality will effected
2. the finer the product, the better the quality in general.
The hpmc celluse usually can through 80 mesh and 100 mesh fineness , 120 mesh relatively small , 120 mesh very fine.
3. the higher the transmittance of Hydroxypropyl Methyl Cellulose (HPMC) in aqueous solution, the better its quality.
Put it in water to form a transparent gel.See its transmittance.The higher the transmittance, the better the quality.This indicates that it contains fewer insoluble substances.
4. the higher the proportion, the better the quality.
Usually because of the hydroxypropyl group in it.The higher the hydroxypropyl content , the better the water retention.
More to visit our website - Hydroxypropyl Methyl Cellulose (HPMC)