Calcium Stearate
Calcium Distearate, Octadecanoic acid calcium salt, CaSt.
- CAS
- 1592-23-0
- EC
- 216-472-8
- Sectors
- Plastics & Polymers, Building & Construction, Textiles, Leather & Paper
Calcium Stearate (CAS 1592-23-0) is a metallic soap formed from stearic acid and lime, supplied as a white fine powder or granular solid, and it acts as an internal and external lubricant, acid scavenger and water repellent in polymer processing, cementitious systems and paper coating. It is characterized by its hydrophobic properties and excellent internal/external lubrication capabilities in polymer processing.
This Technical Grade additive acts as a highly effective acid scavenger, neutralizing catalyst residues in polyolefin production to prevent equipment corrosion. Its high melting point and heat stability make it a staple in high-temperature extrusion and molding.
Beyond plastics, it functions as a Water Repellent in construction materials, significantly reducing water absorption in mortars and concrete. The material is non-toxic and complies with various regulatory standards for indirect food contact applications.
Typical Properties
| Molecular formula | C18H36O2.1/2Ca |
|---|---|
| Molecular weight | 607.02 g/mol |
| Form | Powder |
| Color | white |
| Odor | Fatty acid odor |
| Melting point | 179 °C |
| Density | 1.12 g/cm³ |
| Water solubility | insoluble H2O, ether, chloroform; slightly soluble hot mineral oils [MER06] |
| Flash point | > 260 °C |
| pH | 7-9 (2.2 mg/l, H2O, 20°C) |
| GHS signal word | Warning · Irritant / harmful |
| HS code | 29157030 |
| Grades available | Technical Grade |
Typical literature values for identification; lot-specific results are stated on the certificate of analysis (COA) and the safety data sheet (SDS) that accompany every delivery.
Calcium Stearate
Applications
- Polymer Processing: Serves as an Internal Lubricant and acid scavenger in PVC, PE, and PP to improve melt flow and surface finish.
- Construction Chemicals: Integrated into cementitious systems as a Hydrophobic Agent to provide integral waterproofing for masonry and mortars.
- Paper Coating: Utilized as a lubricant in paper coating formulations to prevent cracking and improve the surface gloss of finished paper.
Safety & Risks
Low toxicity profile; however, excessive dust can form explosive mixtures with air. Ensure proper Dust Explosion Proofing and wear Gloves and Safety Glasses. Hazard Classifications: Non-hazardous for transport.
Packaging
Supplied in 20 kg or 25 kg PE-lined Paper Bags and 500 kg–1000 kg Jumbo Bags.