Stearic Acid (Plastic & Rubber Lubricant)
CAS Number: 57-11-4
Stearic Acid is one of the most widely used fatty acid lubricants in plastic and rubber processing, functioning as an internal lubricant, dispersing agent, and activator for zinc oxide in rubber vulcanization. In PVC, it acts as an internal lubricant to reduce melt viscosity and improve flow. In rubber, stearic acid combined with zinc oxide forms the zinc stearate activator that accelerates vulcanization.
Technical Specifications
| appearance | White flakes or beads |
| melting point (°C) | 54–58 |
| acid value (mgKOH/g) | 195–210 |
| iodine value (gI2/100g) | ≤1.0 |
| purity (C18 content, %) | ≥90 |
Applications
- Rubber vulcanization activator with ZnO
- PVC internal lubrication and melt flow improvement
- Polyolefin processing lubricant
- Metallic soap precursor (Ca, Zn, Mg stearates)
- Cosmetics and personal care emulsifier
Key Features
- Essential vulcanization activator for rubber
- Effective internal lubricant in PVC processing
- Low cost and broad industrial applicability
- Good dispersing effect for fillers and pigments
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CAS Number
57-11-4
Category
Plastic / Rubber AdditivesAvailability
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