HPMC (Hydroxypropyl Methylcellulose) and MHEC (Methyl Hydroxyethyl Cellulose) are both non-ionic, water-soluble cellulose ethers commonly used in construction, pharmaceuticals, food, and cosmetics. They share many similar functions, but their chemical substituents and performance characteristics differ:
Chemical Difference
HPMC: Derived from cellulose, modified with methyl and hydroxypropyl groups.
MHEC: Derived from cellulose, modified with methyl and hydroxyethyl groups.
The difference lies in the side chain substitution:
Hydroxypropyl (–CH₂CHOHCH₃) in HPMC
Hydroxyethyl (–CH₂CH₂OH) in MHEC
Performance Comparison
Property HPMC MHEC
Water retention Very good Good, but slightly lower than HPMC
Workability Smooth, slightly more lubricating Good, but less lubricating
Thickening ability Stronger thickening effect at same dosage Moderate thickening
Thermal stability Higher heat resistance Lower than HPMC
Setting time (cement/plaster) Tends to delay setting more Less retardation effect
Cost Generally higher More economical
Applications
MHEC: Wall putty, plasters, gypsum products, detergent thickener, water-based paints, more common in cost-sensitive construction mixes.
In short:
HPMC provides better water retention, thermal stability, and workability, making it preferred for high-performance tile adhesives and pharma/food uses.
MHEC is cheaper, with adequate performance, more widely used in wall putty, plasters, and cost-sensitive construction materials.
