Overview
Hydroxyethyl Methyl Cellulose (HEMC) is a non-ionic, water-soluble cellulose ether modified with hydroxyethyl and methyl groups. It is synthesized through alkali-catalyzed reactions of cellulose with ethylene oxide and methyl chloride. HEMC is prized for its versatility, acting as a thickener, binder, and stabilizer in aqueous systems. Unlike unmodified cellulose, HEMC dissolves rapidly in cold water without clumping, making it ideal for industrial applications requiring quick hydration. Its compatibility with organic solvents and salts further expands its utility across sectors like construction, where it improves workability and adhesion in cement-based products.
Physical and Chemical Properties
HEMC exhibits pseudoplastic behavior, meaning its viscosity decreases under shear stress—a critical trait for paints and coatings. Solutions typically range from 1,000 to 200,000 mPa·s (measured at 2% concentration, 20°C), depending on the polymer's molecular weight and substitution pattern. The polymer is stable across a broad pH range (3–11) and resists enzymatic degradation. Its thermal stability is limited; prolonged exposure above 50°C may cause viscosity loss. HEMC's film-forming ability and low surface tension contribute to its effectiveness in personal care products like shampoos, where it enhances texture and moisture retention.
Main Applications
In construction, HEMC is a cornerstone additive for dry-mix mortars, improving water retention and sag resistance in vertical applications. It reduces cracking in cementitious materials by slowing evaporation. Tile adhesives containing 0.2–0.5% HEMC achieve superior open time and adhesion strength. The pharmaceutical industry uses HEMC as a controlled-release matrix in tablets and a coating agent. Its non-ionic nature avoids interactions with active ingredients. Cosmetic formulations leverage HEMC's thickening properties in gels and lotions, while food-grade variants serve as emulsifiers in processed foods (E464).
Safety and Storage
HEMC is classified as generally recognized as safe (GRAS) by the FDA for food contact and pharmaceutical use. Industrial-grade powder may cause mild eye irritation; rinsing with water is recommended upon contact. Dust explosion hazards are minimal due to high ignition temperatures (>300°C). Storage requires protection from humidity to prevent caking. Bulk shipments should be palletized and covered with moisture-proof liners. Shelf life exceeds two years in unopened containers below 30°C. For laboratories, desiccators are advised for long-term stability.
B2B Procurement Guide
When sourcing HEMC, buyers must specify key parameters: viscosity (e.g., 5,000–50,000 mPa·s for construction), hydroxyethyl/methyl substitution ratios (commonly 1.5–2.5:1), and particle size (80–200 mesh for rapid dissolution). Technical datasheets should include gel point and ash content (typically <5%). Suppliers often provide customized blends with retarders or superplasticizers for construction applications. MOQs for industrial grades start at 500 kg, with prices influenced by cellulose feedstock costs. Audit suppliers for ISO 9001 certification and batch traceability. Sample testing for pH (6–8 in 1% solution) and moisture content (<5%) is recommended pre-purchase.
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