Aluminium Stearate

Overview

Aluminium Stearate is a metallic soap used as a thickener, gellant, and stabilizer in oil-based and anhydrous cosmetic formulations. It is widely used in sunscreens, lipsticks, and color cosmetics.

INCI Name

Aluminum Stearate

Key Benefits

• Thickens and gels oil phases without water
• Improves water resistance in sunscreen formulations
• Stabilizes pigment dispersions in color cosmetics
• Provides smooth, waxy texture to sticks and balms
• Enhances SPF performance as a co-ingredient

Recommended Applications

• Sunscreens & SPF products
• Lipsticks & lip balms
• Foundations & color cosmetics
• Anhydrous creams & ointments
• Deodorant sticks

Recommended Use Level

0.5–5% in oil phase. For gelling: 3–8%.

Solubility & Phase

Oil-dispersible. Disperse in oil phase with heating (80–90°C) and high shear mixing.

Certifications & Grade

• Cosmetic grade

Storage

Store in a cool, dry place away from moisture. Shelf life: 24 months in sealed packaging.

Commonly Used With

• Shea Butter Refined TX0294 — combine in oil phase for rich anhydrous balms and sticks
• Jojoba Oil (Hallstar USA) — lightweight carrier oil to balance heavy wax systems

Frequently Asked Questions

What does Aluminium Stearate do in sunscreen?

It acts as a rheology modifier and water-resistance agent in sunscreen formulations, helping the product stay on skin longer and improving SPF efficacy.

How do I disperse Aluminium Stearate?

Disperse in the oil phase at 80–90°C with high shear mixing. It will not dissolve in cold oil — heat and agitation are essential for proper dispersion.

Can Aluminium Stearate be used in lip products?

Yes. It is commonly used in lipsticks and lip balms to provide structure and a smooth, waxy texture. Pair with Shea Butter for added moisturization.

Is Aluminium Stearate water-soluble?

No. Aluminium Stearate is oil-dispersible only. It is not suitable for aqueous or emulsion phases — it must be incorporated into the oil phase.

What is the maximum usage level?

Up to 8% for gelling applications. For general thickening and stabilization, 0.5–3% is typically sufficient.