Antioxidant MBI (2-Mercaptobenzimidazole)
CAS Number: 583-39-1
2-Mercaptobenzimidazole (MBI) is a non-staining, non-discoloring antioxidant that provides good protection against thermal oxidation and catalytic degradation induced by heavy metal ions. It is widely used in light-colored and white rubber articles where staining must be avoided, and serves as an effective copper-ion deactivator. MBI is often blended with other antioxidants for synergistic protection in EPDM, NBR, and natural rubber.
Technical Specifications
| ash (%) | ≤0.30 |
| appearance | White to pale yellow powder |
| purity (%) | ≥98.0 |
| moisture (%) | ≤0.50 |
| melting point (°C) | 300–305 (decomp.) |
Applications
- Light-colored and white rubber goods
- EPDM automotive weatherstripping
- NBR food-contact gaskets and seals
- Latex foam requiring non-yellowing performance
- Wire insulation rubber compounds with copper contact
Key Features
- Non-staining and non-discoloring for light rubber goods
- Effective deactivator for copper and manganese catalytic degradation
- Good thermal stability and low volatility
- Synergistic with ZMBT for combined accelerator-antioxidant effect
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