HPMC 40K

Medium-to-high viscosity HPMC for tile adhesive, skim coat, plaster, and mortar systems.

Overview of HPMC 40K

HPMC 40K is a hydroxypropyl methyl cellulose grade designed for construction materials that need water retention, workability, and stable application behavior. It is suitable for tile adhesive, skim coat, gypsum plaster, manual plaster, and mortar systems that need balanced body and easy use.

Technical Specifications

Grade: HPMC 40K

Chemistry: Hydroxypropyl Methyl Cellulose

Label Value: 40000

Viscosity: NDJ 2% 30,000~50,000 mPa·s at 20°C

Other Viscosity Reference: RV 2% 18,000~25,000 mPa·s

CAS No.: 9004-65-3

Methoxy Group Content: 19.0–24.0%

Appearance: White to off-white powder

Hydroxypropoxy Group Content: 4.0–12.0%

Ash: Calculated as NaCl ≤4.0%; calculated as sulfate ≤5.0%v

pH: (1% aqueous solution) 5.0–8.5

Particle Size: <0.200 mm (through 60 mesh) min. 98.5% <0.180 mm (through 80 mesh) min. 90.0%

Benefits of HPMC 40K

Balanced viscosity build for construction materials
Improves water retention and open time
Supports smooth troweling and application feel
Useful in tile adhesive, skim coat, and plaster systems
Delayed solubility supports easier dispersion
Practical for construction-grade sample testing

Typical Applications of HPMC 40K

1.Tile adhesive
Suitable for improving water retention, open time, and smooth troweling behavior.

2.Skim coat, wall putty, and plaster
Useful where the formula needs workability, surface finishing, and stable consistency.

3.Masonry mortar and repair mortar
Appropriate for dry-mix systems that need balanced body and application stability.