Hydroxyethylcellulose (HEC) | Cosmetic Thickener

Description

Hydroxyethylcellulose (HEC) is a non-ionic, water-soluble polymer derived from plant cellulose and used as a cosmetic thickener. It provides viscosity, clarity, suspension and a smooth skin feel, making it ideal for gels, shampoos, conditioners, serums and lotions.

Common uses and benefits

• Clear gels: builds transparent, spreadable gels for hair, face and body.
• Shampoos and body washes: thickens the formula so it pours slowly and sits in the hand instead of running through the fingers.
• Lotions and creams: thickens the water phase of an emulsion and helps keep it stable.
• Hair gels and curl products: gives hold and slip without the stiffness of some other polymers.
• Suspension: helps hold small particles, such as botanical powders or beads, evenly through a formula.
• Compatibility: because it is non-ionic, it mixes well with most surfactants, salts and actives that disturb charged thickeners.

Quick facts

How to use it (Formulating with HEC)

1. Weigh it out. Start with 0.5–1.5% for a gel and 0.1–1% for lotions and shampoos, then adjust to the thickness you want.
2. Disperse it slowly. Sprinkle the powder into the vortex of stirring water, a little at a time. Dumping it in at once makes lumps.
3. Or pre-mix it. Stir the powder into a small amount of glycerin or propylene glycol first, then add that to the water. This separates the particles before they meet water.
4. Give it time. HEC takes a while to hydrate and swell. Keep stirring gently, then rest the mixture until it turns clear and smooth. Slightly warm water speeds this up, but very hot water can cause lumping.
5. Add everything else afterwards. Once the gel is fully hydrated, add your actives, extracts and preservative.

Formulation tips

• Always use a broad-spectrum preservative. That’s because water-based gels thickened with cellulose polymers can grow microbes quickly without one.
• Avoid high-speed mixing once the gel forms, because it traps air bubbles.
• Make a small test batch first, since thickness depends on the grade, the water and your other ingredients.
• Store finished gels in clean, closed containers.

Storage

Keep the powder in a tightly closed container in a cool, dry place away from moisture and direct sunlight. Moisture will make the powder clump.

Who it is for

Haircare and skincare formulators, DIY makers and indie beauty brands who need a reliable clear thickener for water-based products.

For cosmetic use only. Always test and preserve your formulations.

FAQ

What is HEC used for in cosmetics?
HEC thickens water-based products. It is used in gels, shampoos, lotions and cleansers to add body, clarity and a smooth feel.

How do I stop HEC from lumping?
Sprinkle it slowly into stirring water, or pre-mix it with a little glycerin before adding it. Avoid hot water at the start.

How much HEC should I use?
The typical range is 0.1–3%. Gels usually sit around 0.5–1.5%. Start low and increase until you reach the thickness you want.

Is HEC suitable for hair products?
Yes. It thickens shampoos and conditioners and gives hair gels and curl products body and slip.

Does HEC need a preservative?
Yes. Any water-based product made with HEC needs a suitable preservative.