Common and simple methods to distinguish the quality of HPMC cellulose

Common and simple methods to distinguish the quality of HPMC cellulose：

1. The visual state of pure HPMC cellulose is fluffy, and the bulk density is small, with a range of 0.3-0.4g/ml; Adulterated HPMC cellulose has better fluidity and heavier hand feel, which is significantly different from the appearance of authentic products.

2. The whiteness of pure HPMC cellulose is good, which means that the raw materials used in production are pure and the reaction is more thorough without impurities. Compared with relevant foreign cellulose ether products, it can be seen that the whiteness of a good cellulose ether product is always better than that of domestic second-line brand products.

3. Pure HPMC cellulose aqueous solution is clear, with high light transmittance, and water retention rate ≥ 97%; The adulterated HPMC cellulose aqueous solution is turbid, and the water retention rate is difficult to meet the requirements. The light transmittance of the aqueous solution is good, which indicates that the product contains less insoluble substances and high content of active ingredients.

4. Pure HPMC cellulose should not smell ammonia, starch and alcohol; Adulterated HPMC cellulose can often smell all kinds of flavors. Even if it is tasteless, it will feel heavy.

5. Pure HPMC cellulose powder is fibrous under microscope or magnifying glass; The adulterated HPMC cellulose can be observed as granular solid or crystal under the microscope or magnifying glass.

6. A simple test method for the ash content of cellulose ether: weigh one to two grams of cellulose ether, ignite it with a lighter, weigh the ash residue left by the combustion of cellulose ether, and when the ash residue / cellulose ether is ≥ 5%, the quality of cellulose ether is basically unqualified. (there are sometimes errors in this method. First, the manufacturer compounded the products suitable for specific customers for customers before leaving the factory; second, the agents or manufacturers added flammable substances with low ash content when adulterating)

7. Some factories and households use a small amount of C cellulose mixed into hydroxypropyl methyl cellulose ether, and when the aqueous solution of C cellulose meets with tin, silver, aluminum, lead, iron, copper and some heavy metals, precipitation reaction will occur; When c-cellulose aqueous solution coexists with calcium, magnesium and salt, it will not produce precipitation, but will reduce the viscosity of c-cellulose aqueous solution.

8. If conditions permit, directly test the viscosity of aqueous solution of cellulose ether and compare the water retention rate of low content cellulose ether mortar

As a professional cellulose ether manufacturer, Youngcel cellulose will wholeheartedly provide customers with the highest quality products and services