The advanges of HPMC & MHEC in dry mix mortar products
November 22nd 2024
SLEOCHEM hydroxypropyl methyl cellulose (HPMC) and Methyl cellulose MC have stable chemical properties. Mildew resistance and water retention are not affected by changes in pH.
Viscosity can be used between 50,000 and 200,000, but in production, higher viscosity is better. Viscosity is inversely proportional to bond strength. The higher the viscosity, the lower the strength. Regarding the quality of cellulose, mainly the viscosity, it can be tested using a rotational viscometer; or it can be compared by a simple method.
For the comparison, take 1 gram of cellulose of the same viscosity. Add 100 grams of water, put it in a disposable cup and pour it out at the same time. Observe which one dissolves faster, has better clarity and thickens better. The better the transparency, the less impurities.
It is used for low-grade putty powder for interior walls, which has certain thickening and water retention effect and can increase leveling. However, it cannot be used for waterproof putty and external insulation dry mix.
This is because these cellulose will react with cement, grey calcium powder and gypsum powder, inorganic binders. Many people think that these cellulose are alkaline, and generally cement and grey calcium powder are also alkaline. It is thought that they can be used in combination.
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