Re-Dispersible Polymer Powder Rdp for Construction Chemicals Tile AdhesiveDecember 5th 2023
As an important raw material in building materials and chemical industry, hydroxypropyl methylcellulose affects the product quality. Therefore, when selecting, you must polish your eyes. How to judge its quality simply and intuitively.
Whiteness cannot determine whether it is easy to use, but most good products have good whiteness. However, it should also be noted that some unscrupulous manufacturers may add whitening agents in the production process.
Its fineness is generally 80 mesh and 100 mesh, less 120 mesh. The finer the fineness, the better the quality in general.
Put it in water to form a transparent colloid, and look at its transmittance. The greater the transmittance, the better, indicating that there is less insoluble matter in it.
4 specific gravity
The greater the specific gravity, the better the quality. It is more important than that, generally because of the high content of hydroxypropyl in it. If the hydroxypropyl content is high, the water retention is better.
The visual state of pure HPMC is fluffy, while that of adulterated HPMC is better, which has a lot to do with their shape. Through the magnifying glass, you can see that the pure powder is fibrous; The adulterated can be observed as granular solid or crystal.
The above is a simple method to determine the quality of hydroxypropyl methylcellulose (HPMC). At the same time, we must buy from regular manufacturers, which can greatly reduce the possibility of purchasing defective products.