HPMC hydroxypropyl methyl cellulose quality is not the determinant of whiteness, some manufacturers in the production process can not be added to determine product quality whitening agent.
Of course, the deciding factor of hydroxypropyl methyl cellulose quality is not whiteness, some manufacturers cannot judge product quality by adding whiter in the production process, and the quality of hydroxypropyl methyl fiber whiteness is really good.
Hydroxypropyl methyl cellulose HPMC fineness is generally 80 mesh and 100 mesh, and 120 mesh, fineness is fine and uniform, the larger the particle size, the better solubility, good water retention, is high quality cellulose.
Hydroxypropyl methyl cellulose is converted into water, and the viscosity and transparency can be seen after being dissolved in water for a period of time. After the formation of colloid, the higher the light transmission, the lower the transparency, the smaller the internal solubility and the higher the purity.
The larger the proportion, the heavier the better, because the proportion of hydroxypropyl methacrylic acid content is higher, high water retention rate.
At present, the quality of domestic hydroxypropyl methyl cellulose is uneven and the price is greatly different, making it difficult for customers to make the right choice. The modified HPMC of tongwai company, is the result of many years of research, adding trace substances can improve the construction performance, improve the operation, 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.