Calcium stearate

Calcium stearate is a carboxylate of calcium, classified as a type of fatty acid. It is a compound with a wide range of uses, including as a stabilizer in plastics, a lubricant, in the production of waterproofing materials, and in food production as an anti-caking agent.

Chemical Structure

Calcium stearate is composed of two stearate groups, or stearic acid molecules, and one calcium ion. In its pure form, it is a white, waxy powder. It is insoluble in water, but can be dissolved in hot pyridine. The compound can be obtained by the reaction of calcium chloride and sodium stearate in aqueous solution.

Uses

In Plastics

Calcium stearate is used as a stabilizer for PVC, and can also be used in the production of other types of plastics. It helps to prevent the breakdown of the plastic's molecular structure during processing, and also acts as a lubricant, reducing friction between the plastic and the machinery used to shape it.

In Food Production

In food production, calcium stearate is used as an anti-caking agent. It prevents ingredients from clumping together, which can affect the texture and appearance of the final product. It is generally considered safe for consumption, but is not suitable for people with a sensitivity to calcium or stearic acid.

Health and Safety

While calcium stearate is generally considered safe for use in food and in products that come into contact with the skin, it can cause irritation if inhaled. It is recommended that people working with the compound wear protective clothing and use appropriate ventilation.

See Also

• Stearic acid
• Calcium chloride
• PVC
• Anti-caking agent