Calcium stearate
CAS 1592-23-0
EC 216-472-8
Formula C18H36O2.1/2Ca
MW 607.02 g/mol
Salts & Minerals Lubricants & MetalworkingPlastics & PolymersFood & NutritionRubber & TirePersonal Care & CosmeticsPharmaceuticals & HealthcareBuilding & Construction Antioxidant & StabilizerLubricationEmulsification & DispersionFoam ControlRheology Modification
Description
Calcium stearate (CAS 1592-23-0) is a calcium salt of stearic acid, commercially available under trade names including Calstar, Aquacal, and Flexichem. It carries no E-number designation and is classified under HS code 29157030. The molecular formula is C18H36O2·1/2Ca.
In PVC processing, calcium stearate functions as a heat stabilizer by neutralizing hydrogen chloride released during thermal degradation, delaying discoloration and polymer breakdown. In rubber compounding and tablet manufacturing, it acts as an internal and external lubricant, reducing friction between polymer chains or between granules and metal tooling surfaces during compression.
Calcium stearate is supplied in powder form and is available in technical, food-contact, and pharmaceutical grades, with the latter conforming to Ph.Eur. and FCC monographs. The substance is registered under REACH. Procurement teams should confirm grade suitability against application requirements, as specifications for heavy metal content and free acid levels vary across grades.
In PVC processing, calcium stearate functions as a heat stabilizer by neutralizing hydrogen chloride released during thermal degradation, delaying discoloration and polymer breakdown. In rubber compounding and tablet manufacturing, it acts as an internal and external lubricant, reducing friction between polymer chains or between granules and metal tooling surfaces during compression.
Calcium stearate is supplied in powder form and is available in technical, food-contact, and pharmaceutical grades, with the latter conforming to Ph.Eur. and FCC monographs. The substance is registered under REACH. Procurement teams should confirm grade suitability against application requirements, as specifications for heavy metal content and free acid levels vary across grades.
Physical Properties
| Melting Point | 179 °C |
| Density | 1.12 g/cm³ |
| Flash Point | > 260 °C |
| Color | white |
| Odor | Fatty acid odor |
| Form | Powder |
| Water Solubility | insoluble H2O, ether, chloroform; slightly soluble hot mineral oils [MER06] |
| Vapor Pressure | 0Pa at 25℃ |
| pH | 7-9 (2.2 mg/l, H2O, 20°C) |
| Log P | 3.82-14.34 at 25℃ |
Safety & Handling (Learn More)
Warning GHS07
H
H319H335
P
P261P271P280P319P405P501P264+P265P304+P340P337+P317P403+P233P305+P351+P338
Trade & Regulatory
| HS Code | 29157030 |
Other Names
calcium bis(octadecanoate)Aquacalcalstarflexichemflexichemcs
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