This Stearic Acid is a natural saturated long-chain fatty acid occurring in vegetable fats, with an 18-carbon backbone. Stearic Acid is a multi-function anionic oil-in-water emulsifier and stabilizing agent, commonly used in the production of detergents, soaps, and cosmetics such as shampoos and shaving cream products. It is often used in lubricants, providing a soft, pearly and cooling feel on the skin.
Stearic acid is also a great addition to cold process soap recipes if you would like to create an extra firm bar of soap. Keep in mind if you use stearic acid in your recipe, it will trace faster and needs a hotter soaping temperature (at least 70°C) to make sure it stays melted. Stearic Acid can also be used as wax hardener, which helps pillar or freestanding candles hold their shape in warmer climates. It also increases wax opacity (whiteness) and assists with mold release.