Hydroxyethyl cellulose (HEC) is a non‑ionic, water‑soluble cellulose ether. It dissolves readily in cold or hot water to form clear, stable, viscous solutions. HEC is widely used as a thickener, binder, film‑former, suspension aid, and water retention agent.

  • CAS Number: 9004-62-0

  • Appearance: White to off‑white, free‑flowing powder

  • Solubility: Soluble in cold and hot water; insoluble in organic solvents

  • pH (1% solution, 25°C): 6.0 – 8.5

HEC is non‑ionic, salt‑tolerant, and compatible with a wide range of surfactants, pigments, and polymers.

Key Properties-Hydroxy Ethyl Cellulose (HEC)

  • Instant solubility – no heating or neutralization required

  • Pseudoplastic rheology – high viscosity at low shear, easy spraying and leveling

  • Excellent salt tolerance – stable in high‑electrolyte systems (e.g., latex paints, oilfield fluids)

  • Good film formation – clear, flexible films

  • Stable over wide pH range (2–12)

  • Non‑ionic – minimal interaction with other ingredients

Main Applications-Hydroxy Ethyl Cellulose (HEC)

Industry Use
Paints & coatings Thickener for water‑based latex paints, texture coatings, spray paints (anti‑sag, leveling)
Personal care & cosmetics Shampoos, body washes, toothpastes, lotions – non‑ionic thickener with smooth feel
Oil & gas drilling Fluid loss control additive, viscosifier for drilling and completion fluids
Construction Cement and gypsum products – improves water retention, workability, and adhesion
Pharmaceuticals Tablet binder, ophthalmic lubricant (artificial tears), topical gel base
Cleaning products Thickener for acidic or alkaline detergents, toilet cleaners
Agriculture Spray drift control agent, suspension aid for pesticide formulations

Typical Technical Data (Standard Grade)

Parameter Range
Viscosity (2% solution, 25°C, Brookfield) 10 – 100,000 mPa·s (multiple grades)
Moisture content ≤ 8%
Ash content (sulfated) ≤ 5%
pH (1% solution) 6.0 – 8.5
Particle size (through 100 mesh) ≥ 95%
Degree of substitution (MS) 1.8 – 2.5 (varies)

Low, medium, and high viscosity grades available for specific applications.

Frequently Asked Questions (FAQs)

1. How is HEC different from HPMC or CMC?

  • HEC is non‑ionic and dissolves in both cold and hot water without gelation.

  • HPMC requires cold water for full dissolution and has thermal gelation.

  • CMC is anionic and can precipitate in acidic or high‑salt environments. HEC is more salt‑tolerant.

2. Does HEC dissolve in hot water?
Yes. Unlike HPMC, HEC dissolves directly in hot water without forming a gel. This makes it ideal for high‑temperature applications (e.g., oil drilling).

3. How do I prepare an HEC solution?
Slowly add HEC powder into vigorously stirred water (any temperature). Continue stirring until fully dissolved (10–30 minutes). For faster dissolution, pre‑disperse in a small amount of water‑miscible solvent (e.g., glycol) before adding to water.

4. What viscosity grade should I choose?

  • Low viscosity (10–500 mPa·s): spray coatings, ophthalmic solutions, self‑leveling compounds

  • Medium viscosity (1,000–15,000 mPa·s): latex paints, shampoos, drilling fluids

  • High viscosity (≥20,000 mPa·s): texture coatings, adhesives, water‑retention agents

5. Is HEC safe for personal care and pharmaceuticals?
Yes. HEC is non‑toxic, non‑allergenic, and widely used in cosmetics, eye drops, and oral tablets. It is listed in USP/NF, EP, and Ph. Eur.

6. Can HEC be used in acidic or alkaline formulations?
Yes. HEC is stable from pH 2 to 12, making it suitable for acidic cleaners, alkaline detergents, and cementitious mixes.

7. How does salt affect HEC solutions?
HEC has excellent salt tolerance. Moderate salt concentrations may slightly reduce viscosity, but HEC does not precipitate easily – unlike anionic thickeners (CMC).

8. What is the shelf life of HEC?
2 years in original unopened packaging, stored in a cool, dry place. Keep tightly sealed – HEC absorbs moisture from air.

9. Can HEC be mixed with other thickeners?
Yes. It is compatible with HPMC, CMC, xanthan gum, and associative thickeners. Often used in blends to fine‑tune rheology.

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