Calcium stearate and its application

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What is Calcium Stearate? Calcium stearate has a molecular structure of C36H70CaO4. It’s a white powder that is not soluble in water. This compound can be used to waterproof, lubricate, or add plastic.
Calcium stearate (also known as calcium oxide or stearic salt) is a common calcium salt found in food, cosmetics and plastics. The use of calcium stearate is not without its pros and cons.
Synthesis and use of calcium stearate
1. The synthesis is calcium stearate. The calcium chloride with a concentration of 1074kg/m3 (also known as 10degBe), is added to the sodium-stearate solution, and a metathesis reaction takes place at approximately 65degC. The calcium stearate product is separated by precipitation. The finished product is obtained after it has been filtered, washed in water, and then dried at around 90degC.
2. In 300mL hot water at 55 degrees Celsius, dissolve 5.60g of calcium oxide (0.1mol). Pour 51.3g of stearic acetic acid, which is chemically pure, in 350mL water heated to 70degC. Add 0,75g of diethanolamine and stir it until emulsified. The prepared stearic-acid emulsion is added to the suspension of calcium oxide within 2h and thoroughly stirred. After that, the white, insoluble material, which is calcium stearate was filtered and dried.
3. Direct method: Add a certain quantity of stearic acids and CaO in a pot equipped with a stirring device and thermometer. Heat it until it melts. Slowly add the catalyst, H2O2, while constantly stirring. Apply a vacuum for controlling the reaction temperature to 140-150degC. The reaction lasts 1.52.0h. After the reaction has been completed, the material must be discharged, cooled down, and then crushed to produce the final product.
4. Metathesis method – Dissolve the stearic solution in 20 times as much hot water. Add caustic soda saturated solution. Perform saponification at approximately 75degC. This will generate a dilute sodium stearate. The sodium stearate and calcium chloride solutions were then combined. Metathesis was carried out around 65 degrees Celsius, and calcium stearate was precipitated. The finished product is filtered and washed in water before being dried at around 90degC.

Calcium stearate applications
Calcium stearate has many uses, including as a heat stabilizer for polyvinylchloride, a lubricant used in plastic processing, or a mold release. When mixing lead soap with basic salt, it can accelerate the gelation process.
The non-toxic film and appliance, such as medical equipment and food packaging, also uses calcium stearate. Calcium stearate may also be used in polyethylene or polypropylene as a halogen-absorbing agent to reduce the harmful effects of residual catalyst on color stability and durability.
In rubber processing, calcium is used to soften rubber. It can be used on both natural rubber and synthetic, but it does not affect vulcanization. It is used in a variety of applications, including a lubricant, waterproofing agents for textiles and paints as well as a plasticizer for plastic records. As a halogen absorbent for polyethylene and polypropylene, as well as a release agent and lubricant in thermosetting plastics like phenolic and amino; as lubricant or thickening agents for grease; as waterproofing agents for waterproof fabrics; as an agent of flattening for paint; and as lubricant to remove pencil lead. Anticaking agents are made from food-grade Calcium Stearate.
Calcium stearate can also be used to make pencil lead and in medicine.

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