Stearic Acid (Rubber Grade)
CAS Number: 57-11-4
Stearic Acid rubber grade is a critical vulcanization activator used in combination with zinc oxide to form the zinc stearate complex that activates accelerated sulfur vulcanization. It also acts as an internal lubricant to improve processing, reduce compound viscosity, and aid dispersal of fillers and other compounding ingredients. Rubber-grade stearic acid is available in flake and bead forms.
Technical Specifications
| appearance | White flakes or beads |
| purity (C18, %) | ≥90 |
| melting point (°C) | 54–58 |
| acid value (mgKOH/g) | 195–210 |
| iodine value (gI²/100g) | ≤1.0 |
Applications
- Tire and rubber compound vulcanization activation
- Internal lubricant in rubber processing
- Filler and pigment dispersant in rubber
- Rubber sole and foam compounds
- Latex stabilizer
Key Features
- Essential vulcanization activator paired with ZnO
- Improves processability and reduces Mooney viscosity
- Good filler dispersion aid
- Standard ingredient in virtually all rubber formulations
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