The difference between hpmc and cmc
HPMC (hydroxypropyl methyl cellulose) and CMC (carboxyl methyl cellulose) differ in properties and applications, and there are also some methods to distinguish hydroxypropyl methyl cellulose and carboxyl methyl cellulose's authenticity.
1.Properties and applications: HPMC is a nonionic cellulose ether with good thermal stability and acid-base resistance, which can be used to make building materials and food additives, etc.
CMC, on the other hand, is an ionic cellulose ether with good water solubility and thickening properties, which can be used to make dyeing pastes and ceramic pastes, etc.
2.Price: Due to the nonionic properties of HPMC, its price is usually higher than that of CMC, and the usage is also relatively less.
3.Viscosity: CMC is suitable for low viscosity occasions, while HPMC can be used for higher viscosity occasions. When purchasing, choose the appropriate viscosity grade according to specific needs.
4.Identifying authenticity: For counterfeit and inferior products in the market, some simple methods can be used for identification.
For example, pass through a 40-60 mesh sieve in the laboratory to observe whether there are impurities or particles present; or prepare a 30% water solution and put it in the refrigerator for cold storage, and observe whether there are crystals precipitated. These methods can be used to preliminarily judge the authenticity of the product, but to ensure product quality, it is recommended to purchase products from regular manufacturers and conduct strict quality inspections.