Zinc stearate
Zinc stearate (CAS: 557-05-1), with the molecular formula [CH3(CH2)16COO]2Zn and a molecular weight of 632.33 g/mol, is the zinc salt of stearic acid. This white powder is largely insoluble in water and alcohol but soluble in benzene. It serves as a critical component in various industrial applications, primarily functioning as a release agent, lubricant, and stabilizer.
- IUPAC
- Stearic acid zinc salt
- Synonyms
- Stearic acid zinc salt
![Zinc stearate ([CH3(CH2)16COO]2Zn) — chemical structure, CAS 557-05-1; Chemistry, fine chemical supplied by Tech Serve Solutions](/_next/image?url=https%3A%2F%2Fpub-f4d920c906024441a773a96f7098e551.r2.dev%2Fimages%2Fproducts%2F557-05-1.png&w=3840&q=75)
Lubricant and Release Agent
Zinc stearate is widely employed in the plastics and rubber industries as an internal and external lubricant and release agent. It facilitates material flow during moulding and prevents adhesion to processing equipment, improving surface finish and production efficiency.
Stabiliser in Polymers
In PVC and other polymer formulations, zinc stearate acts as a heat stabiliser. It helps to prevent degradation during processing at elevated temperatures, extending the lifespan and maintaining the integrity of the polymer.
Water Repellent
Its hydrophobic nature makes zinc stearate effective in waterproofing textiles, paper, and construction materials. It forms a protective barrier that repels water, enhancing durability and performance in damp environments.
Anti-caking Agent
In powder formulations, zinc stearate functions as an anti-caking agent, preventing clumping and ensuring smooth flowability. This property is valuable in cosmetics, pharmaceuticals, and industrial powders.
| Molecular weight | 632.33 |
|---|---|
| Linear formula | [CH3(CH2)16COO]2Zn |
| Assay | 10-12% Zn basis |
| Grade | CP |
| Solubility | alcohol: insoluble(lit.)benzene: soluble(lit.)diethyl ether: insoluble(lit.)water: insoluble(lit.) |
| Autoignition temp | 1454 °F |
| Loss on drying | ≤1% loss on drying, 105 °C |
| Melting point | 128-130 °C(lit.) |
| Impurities tested | ≤3.5% free acid (as stearic acid) |
| Ignition residue | 12-15% |
|---|
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
| Availability | available only in Japan |
|---|
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is Zinc Stearate used for?
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Zinc stearate is primarily used as a lubricant, release agent, and heat stabiliser in the plastics and rubber industries. It also finds application as a waterproofing agent and an anti-caking agent in various powder formulations.
What is the CAS number and chemical formula for Zinc Stearate?
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The CAS number for Zinc Stearate is 557-05-1, and its chemical formula is [CH3(CH2)16COO]2Zn.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies Zinc Stearate in CP (Chemically Pure) grade with an assay of 10-12% Zn basis. It contains a maximum of 3.5% free acid (as stearic acid) and has a loss on drying of ≤1% at 105 °C. We do not represent this product as USP, BP, or EP grade.
What are the safety and handling precautions for Zinc Stearate?
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Zinc stearate has an autoignition temperature of 1454 °F. As with all chemicals, handle with appropriate personal protective equipment in a well-ventilated area. Avoid dust formation and ignition sources. Refer to the Safety Data Sheet (SDS) for comprehensive handling and safety information.
Is Zinc Stearate a controlled substance?
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Based on the provided data, Zinc Stearate is not listed as a controlled substance.
How is Zinc Stearate packed and shipped by TSS?
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Zinc Stearate is available only in Japan. Please contact our sales team for specific packing and shipping details for your region and order.
How can I request a quote or sample for Zinc Stearate?
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To request a quote or sample for Zinc Stearate, please contact the Tech Serve Solutions sales department through our website or by phone. Our team will be pleased to assist you.
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