How to Determine the Quality of HPMC in a Simple and Intuitive way?

As an important raw material in the building materials chemical industry, hydroxypropyl methylcellulose affects the quality of products. Today DJCHEM introduces you to how to determine the quality of hydroxypropyl methylcellulose (HPMC) in a simple and intuitive way.

Whiteness

Although whiteness does not determine whether HPMC is good or not, most of the good products have good whiteness. However, it should be noted that some unscrupulous manufacturers may add whitening agents in the production process.

Fineness

The fineness of hydroxypropyl methylcellulose HPMC generally has 80 mesh and 100 mesh, 120 mesh is less. The finer the fineness, generally speaking, the better the quality.

Transmittance

Put hydroxypropyl methylcellulose (HPMC) into the water, the formation of transparent colloid, look at its translucency, the greater the translucency of the better, indicating that the insoluble matter inside less.

Specific gravity

The higher the specific gravity, the better the quality. The higher specific gravity is generally due to the high content of hydroxypropyl. And the high content of hydroxypropyl, the water retention is better.

Shape

Pure HPMC is fluffy visually, while adulterated HPMC is more fluid, which has a lot to do with their shape. Through a magnifying glass, you can see that pure HPMC powder is fibrous; while adulterated HPMC can be observed as granular solids or crystals.

Only genuine methylcellulose can withstand the four seasons

The reaction process is precisely controlled to produce HPMC, which is completely substituted and very well homogeneous. Its aqueous solution is clear and transparent with few free fibers. The compatibility with the main materials such as rubber powder, cement, and lime is particularly strong, which can make the main materials play a good performance. But the reaction of bad HPMC free fiber, substitution group distribution is not uniform, poor water retention and other properties, resulting in high-temperature weather moisture evaporation. And add a lot of admixture of the so-called HPMC, mutual compatibility is difficult to coordinate, so water retention and other performance are even worse. When using poor quality HPMC, it will cause low strength, short opening time, powdering, cracking, bulging, and falling off, which will make construction more difficult and greatly reduce the quality of the building.