How to simply and intuitively determine the quality of hydroxypropylmethylcellulose (HPMC)?

(1) Whiteness: Although whiteness does not determine whether HPMC is easy to use, and if a brightener is added in the production process, it will affect its quality.However, most of the good products have good whiteness.

(2) Fineness: The fineness of HPMC is generally 80 mesh and 100 mesh, and 120 mesh is less.

(3) Light transmittance: After putting hydroxypropylmethylcellulose (HPMC) in water to form a transparent colloid, look at its light transmittance. The greater the light transmittance, the better, indicating that there are fewer insolubles inside.The transmittance of vertical reactors is generally good, and those of horizontal reactors are worse, but it does not mean that the quality of vertical reactor production is better than that of horizontal reactor production. There are many factors that determine the quality of the product.

(4) Specific gravity: The larger the specific gravity, the heavier the better.The specific gravity is large, generally because of the high content of hydroxypropyl in it, and the high content of hydroxypropyl, the water retention is better.