Three simple steps to tell the difference between good and bad HPMC
Visually HPMC is a white, powdered product, colourless and tasteless, it has thickening capacity, salt resistance low ash powder, pH stability, water retention, dimensional stability, excellent film formation, and extensive enzyme resistance, dispersibility and adhesion. According to these characteristics we have targeted to introduce you to the following three simple methods to test the quality of HPMC.
1, dissolution method, take a certain amount of hpmc powder, put it into 5 times its quality of pure water (general bucket of water can be, so the effect will be more obvious), stir evenly, and then let it stand for about 5, 6 minutes and then observe. The less inclusions, the better the quality of the hpmc. This method is simple, but can only be roughly distinguished.
2, film method, take a certain quality of hpmc powder, into its quality of 2 times the water, stirring average after standing for 2 minutes, then the solution will be poured on a clean and transparent glass, the glass placed in a ventilated back shade will be cool to drive, to be fully dry after uncovering. Look at the removed polymer film. The higher the transparency the better the quality, then pull it moderately outwards to observe the toughness and elasticity. Finally, cut it into strips, soak it in water and again observe the degree of dissolution of HPMC, different from the dissolution method is the less dissolved indicates better quality, this method is slow but can better distinguish between good and bad products.
3, ash method, take a certain amount of hpmc to weigh it, and then square it into a ceramic or metal container for heating and heating, the temperature reaches about 500 degrees to be cooled and weighed again, the lighter the quality is good.