- Calcium stearate (stearates)
- Magnesium stearate (magnesium stearate, magnesian stearate) - thinly crushed white powder, slightly soap to the touch. Represents magnesian stearate or mix of salts stearin and synthetic fatty acids. It is dissolved in warm alcohol, stirred in oils, it is practically not dissolved in water. Magnesium stearate melts at temperature about 88 °C. Density: 1,02 g/cm ³.
It is considered safe for consumption by the person at the level of lower than 2500 mg/kg a day. Food additive of E572.
Chemical formula: Mg(C18H35O2)2
- Sodium stearate (sodium stearate, sodium stearate) - powdery substance, white or white with yellow shade, with slight fat smell. Represents sodium stearate or mix of salts stearin and synthetic fatty acids. It is badly dissolved in cold water, not dissolved in many organic solvents, dissolved in ethanol and hot water. Anionny surface-active substance (SAS).
Receive neutralization of spirit of stearic acid solution of sodium hydroxide or sodium carbonate.
Chemical formula: C18H35O2Na
- Zinc stearate - represents homogeneous thin, soft amorphous powder of white color. Is surface-active substance. It is applied as vulcanization activator and the plasticizer of rubbers. It is especially recommended for production of transparent rubbers. It is applied also to plasticization of rubber stocks. It is used as pripudrivatel for prevention of adhesion of rubber stocks and products. The anti-blocking greasing in production of rubbers. Zinc stearate dosage when using as vulcanization activator and the plasticizer of rubbers of 2 - 5% of masses.
Zinc stearate is used as the greasing agent when processing a number of plastic. Is thermo - and light the stabilizer of products from PVC, it is usually entered jointly with calcium stearates, lead, barium, cadmium (by production of linoleum, artificial skin, shoe plastic compounds, packaging film, etc.). Dosage when using in compositions of plastic of 0,1 - 1% of masses.
In production of molding powders zinc stearate is used as the greasing substance, prevents adherence of press materials to rolls, screws in the course of production and to forms when processing in products. Dope in ester impregnations for sheet molding materials, steklonapolnenny premixes, etc.
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