2025-09-06 by BLOG

 

HPMC – Hydroxypropyl Methylcellulose

A multifunctional, non-ionic cellulose ether widely used as a thickener, binder, film former, stabilizer, dispersant, and water-retention agent in various industries.

Basic Information

  • Chemical Name: Hydroxypropyl Methylcellulose

  • Abbreviation: HPMC

  • Appearance: White or off-white powder

  • Odor/Taste: Odorless, tasteless

  • CAS No.: 9004-65-3

  • Molecular Formula: C56H108O30 (typical, varies with substitution degree)

  • Solubility: Soluble in cold water, insoluble in hot water, alcohol, and most organic solvents

  • Form: Fine powder, available in different viscosities and grades

Key Properties

  • Thickening: Provides viscosity and consistency in formulations

  • Water Retention: Improves hydration and prevents premature drying

  • Film-Forming: Creates strong, transparent, and flexible films

  • Thermal Gelation: Forms gel upon heating and recovers upon cooling

  • Stability: pH-stable (3–11), resistant to enzymes and microbial degradation

  • Lubrication: Improves processability in tablets and construction mixes

Product Grades & Applications

1. Construction Grade

  • Applications: Tile adhesives, wall putty, self-leveling compounds, cement-based mortars, gypsum products

  • Functions: Improves water retention, adhesion, workability, and open time

2. Pharmaceutical Grade

  • Applications: Tablet binders, controlled-release coatings, capsule shells, ophthalmic formulations

  • Functions: Film former, controlled drug release, stabilizer

3. Food Grade (E464)

  • Applications: Food thickener, emulsifier, stabilizer in sauces, bakery products, beverages

  • Functions: Provides texture, stability, and fat replacement

4. Detergent & Daily Chemical Grade

  • Applications: Liquid detergents, shampoos, hand sanitizers, toothpaste

  • Functions: Thickener, stabilizer, foaming enhancer

5. Paint & Coatings Grade

  • Applications: Latex paints, coatings, inks

  • Functions: Thickening, leveling, suspension, and film formation

Typical Specifications

  • Viscosity Range: 50 – 200,000 mPa·s (depending on grade, 2% solution, 20°C)

  • Moisture Content: ≤5%

  • pH (1% solution): 5.0 – 8.0

  • Gel Temperature: 60 – 90°C (depending on substitution)

  • Particle Size: ≥98% pass through 80 mesh

Packaging & Storage

  • Packaging: 25 kg bags (multi-layer paper bag with PE inner liner) or customized

  • Storage: Keep in cool, dry place, away from moisture and direct sunlight

  • Shelf Life: 2 years (if stored properly in unopened bags)