Stearic Acid

Stearic Acid – Plant-Derived Thickener & Emulsifier

Stearic Acid is a saturated fatty acid from natural oils like shea butter, cocoa butter, and coconut oil. Widely used in cosmetic and personal care formulations, it enhances texture, stability, and skin feel—making it a staple for formulators seeking rich, luxurious products.

Key Benefits:
Emulsifier: Helps blend oil and water phases in creams and lotions.

Thickening Agent: Adds body and firmness to emulsions and butters.

Skin Conditioning: Softens and protects the skin barrier.

Soap Hardener: Improves hardness and opacity in cold process soaps.

Common Applications:
Lotions, creams, and body butters

Shaving creams and deodorants

Hair conditioners and styling products

Cold process and melt-and-pour soaps

Use Rate:
Product Type Recommended Use Rate
Lotions & Creams 2% – 5%
Soaps 3% – 8%
Hair Products 1% – 3%

pH Stability:
Stable between pH 4.0 to 9.0

Compatible with most cosmetic actives and preservatives.

Formulator’s Note
Stearic Acid should be added during the heated oil phase, melting at approximately 69–70°C. It pairs well with emulsifiers like Glyceryl Stearate, Cetyl Alcohol, and Polysorbates to create smooth, stable emulsions.

Pro Tip: In soap making, Stearic Acid boosts bar hardness and opacity. Use sparingly to avoid overly stiff or crumbly textures.