How to judge the quality of hydroxypropyl methylcellulose?

Nowadays, there are more and more hydroxypropylcarboxymethylcellulose sales markets, and the prices are uneven. How to easily and quickly determine the quality of hydroxypropylcarboxymethylcellulose has become an important issue! So how to judge the quality of hydroxypropyl methylcellulose?

1. First, look at the whiteness of hydroxypropyl cellulose; although whiteness cannot determine whether HPMC is suitable for use, some unscrupulous manufacturers will add a whiteness-increasing agent during the processing, which will harm it. quality. But generally speaking, most of the high-quality cellulose ethers have better whiteness.

2. Secondly, it depends on the fineness of hydroxypropyl methylcellulose: the particle size of hydroxypropyl carboxymethylcellulose is 80-100 mesh, less than 120 mesh, and the particle size of hydroxyethyl cellulose HECHPMC is about 100 mesh. Most hpmc is 60-80 mesh. Generally, the softer the methylcellulose, the better the dispersion.

3. The other is to see the clarity of the cellulose ether in the solution: put HPMC into water to form a transparent colloidal solution. The higher the clarity, the higher the clarity, which means the lower the insoluble substances.