- Calcium stearate is a white, waxy powder that serves as a calcium salt of stearic acid, a long-chain saturated fatty acid commonly derived from animal or vegetable fats.
- It is insoluble in water but slightly soluble in hot alcohols and some organic solvents. Its chemical formula is Ca(C₁₇H₃₅COO)₂, and it is often classified as a type of metal soap. The compound is widely used due to its lubricating, water-repellent, and stabilizing properties. It is considered non-toxic and relatively safe for use in a broad range of industries.
- In industrial applications, calcium stearate acts as a lubricant, release agent, and anti-caking agent. In plastics and rubber manufacturing, it prevents materials from sticking to molds and machinery, enhancing processing efficiency and product quality. It is also a common stabilizer in polyvinyl chloride (PVC) processing, where it helps maintain thermal stability during extrusion and molding. In the construction sector, calcium stearate is incorporated into cement, concrete, and mortar to improve water resistance and workability, reducing the risk of moisture-related damage.
- In the pharmaceutical and food industries, calcium stearate is used as a flow agent in the production of tablets and capsules. It prevents ingredients from clumping together and ensures smooth manufacturing processes. As an additive in food, it is assigned the E number E470 and is generally regarded as safe when used within prescribed limits. Additionally, calcium stearate finds use in personal care products like cosmetics and soaps, where it enhances texture and stability.
