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Difference between HPMC and CMC? How to identify the real and the fake?

Release time:

2023-11-09

Source:

reticulation

There are some differences between HPMC (Hydroxypropyl Methyl Cellulose) and CMC (Carboxymethyl Cellulose) in terms of nature and use, and there are also some ways to identify their authenticity. Nature and use: HPMC is a kind of non-ionic cellulose ether, with good thermal stability and acid and alkali resistance, it can be used to make building materials, food additives, etc. CMC, on the other hand, is a kind of ionic cellulose ether, with good thermal stability and acid and alkali resistance. CMC, on the other hand, is an ionic cellulose ether with better water solubility and thickening, which can be used to make printing and dyeing slurry, ceramic slurry and so on.

Price: Due to the non-ionic property of HPMC, its price is usually more expensive than CMC, and the dosage is relatively small.

Viscosity: CMC is suitable for low viscosity, while HPMC can be used for higher viscosity. When purchasing, you should choose the appropriate viscosity grade according to your specific needs.

Identification of authenticity: Counterfeit products that exist in the market can be identified by some simple methods. For example, it can be sieved through a 40-60 mesh sieve in the laboratory to observe whether there are impurities or particles present; or prepare a 30% aqueous solution, put it into the refrigerator and observe whether there are crystals precipitated. These methods can initially determine the authenticity of the product, but in order to ensure the quality of the product, it is recommended to purchase products from regular manufacturers and conduct strict quality testing.

In short, H is non-ionic, expensive, low dosage, CMC is ionic, the price is lower than H, applicable to low viscosity, buy as much as possible to buy instant (instant and ordinary difference of 500 yuan / ton) additives generally use light propyl methyl cellulose 200,000 units of the use of lower viscosity, commonly used in mortar 400 viscosity of the current market, 90% of the whole propyl methyl cellulose is according to the false, simple and crude identification Approach, take the laboratory 40-60 mesh sieve sieve, or 30% aqueous solution, refrigerated, to see if there are crystals.