(1) Whiteness: Whiteness cannot determine whether HPMC is easy to use, and if whitening agents are added during the production process, it will affect its quality. However, most good products have good whiteness.
(2) Fineness: The fineness of HPMC is generally 80 mesh and 100 mesh, and 120 mesh is less common. Most HPMC produced in Hebei is 80 mesh. The finer the fineness, the better it is generally.
(3) Transparency: Put hydroxypropyl methylcellulose (HPMC) in water to form a transparent colloid, and then observe its transmittance. The higher the transmittance, the better, indicating that there are fewer insoluble substances in it. The transmittance of vertical reactors is generally good, while that of horizontal reactors is worse, but this does not mean that the quality of vertical reactor production is better than that of horizontal reactor production. There are many other factors that determine product quality.
(4) Specific gravity: The larger the specific gravity, the heavier it is. The higher the specific gravity, the better it is. The higher the specific gravity, the higher the water retention.
