Adulterated hydroxypropyl methyl cellulose and pure HPMC difference

1. Pure HPMC visual state is fluffy, the bulk density is small, the range is: 0.3-0.4g/ mL; Adulterated HPMC liquidity is better, feel more heavy, and the appearance of the genuine there are obvious differences.

2. Pure HPMC aqueous solution has high light transmittance and water retention rate ≥97%. Adulterated HPMC aqueous solution is turbid, water retention rate is difficult to reach 80%.

3. Pure HPMC should not smell ammonia, starch and alcohols; Adulterated HPMC can often smell all kinds of taste, even if tasteless, will feel heavy.

4. Pure HPMC powder is fibrous under microscope or magnifying glass; Adulterated HPMC granular solids or crystals can be observed under a microscope or magnifying glass.

At present, the quality of domestic hydroxypropyl methyl cellulose HPMC is uneven and the price is greatly different, making it difficult for customers to make the right choice. Foreign company modified HPMC, is the result of many years of research, adding trace substances can improve the construction performance, improve operability, of course, will affect some other performance, but in general it is efficient; And domestic manufacturers of HPMC a large number of other ingredients, the only purpose is to reduce the cost of the product, resulting in water retention, adhesion and other performance greatly reduced, resulting in many building quality problems