How to determine the quality of hydroxypropyl methyl cellulose?

HPMC is short for Hydroxypropyl Methylcellulose, It is also Non-ionic cellulose ether, it is is a natural polymfer cellulose as raw material, made of a series of chemical processing and non-ionic cellulose ether. It is white powder with good water solubility. hpmc have many properties such as thickening, adhesion, dispersing, emulsifying, film, suspended, adsorption, gel, and protective colloid properties of surface activity and maintains moisture function properties . Hydroxypropyl Methyl Cellulose are widely used in construction materials,building materials, coatings industry, synthetic resin, ceramic industry, textile, agriculture, daily chemical and other industries. Our product are mainly to used for the construction industries.

(1) whiteness: whiteness does not determine whether HPMC is good or not, and if whitener is added in the production process, it will affect its quality.However, good products are mostly white.
(2) fineness: the fineness of HPMC generally has 80 orders and 100 orders, with fewer 120 orders. Most HPMC produced in shandong province has 80 orders.
(3) transmittance: put hydroxypropyl methyl cellulose (HPMC) into water, after the formation of a transparent colloid, see its transmittance, transmittance of the greater the better, insoluble in less.The transmittance of vertical reactor is generally good, while that of horizontal reactor is worse, but it does not mean that the production quality of vertical reactor is better than that of horizontal reactor.
(4) specific gravity: the greater the specific gravity, the heavier the better.Than major, because the hydroxypropyl content is high in general, hydroxypropyl content is high, water retention is better.

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