How can we identify the hydroxypropyl methylcellulose

 Hydroxypropylmethylcellulose its use is quite extensive, it can be used as an adhesive used in the construction industry, but also in coating operations, as a thickener, dispersing agent and stabilizer used, it may act in plastics as a lubricant, softener to use. It uses the occasion there are many, not the same role. The purchase of hydroxypropyl methylcellulose in the market, how to recognize it do? First, from its appearance to identify a white powder on its appearance, its particle size is generally 100 mesh probability is 98.5% by, as well as if you are using 80 mesh, then the probability of adoption it is more like 100 percent even higher. Second, from its carbonization temperature up of identification, usually in the carbonization temperature it takes is 280-300 ℃, when it has not yet reached this temperature carbonization, then it is not true. Third, by its color temperature to identify, in general hydroxypropyl methyl cellulose to a certain temperature will change color, the temperature is 190-200 ℃. Fourth, by its physical characteristics to distinguish it generally insoluble in water as well as more appropriate proportion of ethanol / water, when dissolved in water, its activity and stability, there will be some changes, like its viscosity and The solubility will have a certain amount of change. When general greater solubility, its viscosity decreases. Through the above four methods, you can make out the hydroxypropyl methyl cellulose.