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10 Things You Need to Know About HPMC and MHEC for Block Laying Adhesive.
1. What is HPMC and MHEC?
HPMC stands for hydroxypropyl methylcellulose, and MHEC stands for methyl hydroxyethyl cellulose. They are both cellulose ether derivatives used as additives in building materials.
2. What are their functions in block laying adhesives?
HPMC and MHEC can improve the water retention and workability of block laying adhesives, as well as enhance their bonding strength and anti-sagging properties.
3. Can they replace cement and sand in block laying adhesives?
No, HPMC and MHEC are not meant to replace cement and sand. Instead, they act as auxiliary materials that can improve the performance of block laying adhesives.
4. What is the recommended usage of HPMC and MHEC in block laying adhesives?
The recommended dosage of HPMC and MHEC in block laying adhesives is 0.3% to 0.5% of the cement weight.
5. What is the solubility of HPMC and MHEC in water?
HPMC and MHEC are both soluble in cold water and can thicken it. They also have good solubility in organic solvents.
6. What is the pH range of HPMC and MHEC?
The pH range of HPMC and MHEC is typically between 5.0 and 8.0.
7. Are HPMC and MHEC safe for the environment?
Yes, both HPMC and MHEC are biodegradable and generally considered safe for the environment.
8. What other applications do HPMC and MHEC have in the construction industry?
HPMC and MHEC can also be used as additives in mortar, putty, and tile adhesive to enhance their performance.
9. How should HPMC and MHEC be stored?
HPMC and MHEC should be stored in a dry and ventilated place, away from moisture and fire. They should also be sealed tightly to prevent contamination.
10. Can HPMC and MHEC be used in cold weather?
Yes, HPMC and MHEC can still function well in cold weather, but the dosage may need to be adjusted accordingly.
In conclusion, HPMC and MHEC are cellulose ether derivatives commonly used as additives in block laying adhesives to improve their workability, bonding strength, and anti-sagging properties. They are safe for the environment, can be stored properly, and have other applications in the construction industry. However, they cannot replace cement and sand, and their dosage may need to be adjusted in different weather conditions.
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