How to judge the quality of hydroxypropyl methyl cellulose?
How to judge the quality of hydroxypropyl methyl cellulose?
(1) whiteness: whiteness, although it does not determine whether
HPMC is easy to use, and if whitening agent is added in the production process, it will affect its quality.However, good products are mostly good in whiteness.
(2) fineness: HPMC fineness is generally 80 mesh and 100 mesh, 120 purposes less, most of the HPMC produced in Shandong 80 mesh, the finer the fineness, generally speaking, the better.
(3) transmittance: the hydroxypropyl methyl cellulose (HPMC) into the water, the formation of transparent colloid, to see its transmittance, the greater the transmittance, the better, indicating that there is less insoluble matter.The transmittance of vertical reaction kettle is generally good, and that of horizontal reaction kettle is worse, but it cannot be explained that the quality of vertical reactor production is better than that of horizontal reactor production, and there are many factors to determine the quality of product.
(4) specific gravity: the larger the specific gravity, the heavier it is better.More than significant, generally because of the high content of hydroxypropyl, hydroxypropyl content is high, it is better to retain water.
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