Dibenzyl Disulfide (DBDS) Extreme Pressure Additive
Dibenzyl disulfide (DBDS) is a highly effective thermally active sulfur-based extreme pressure additive used in gear and metalworking lubricants. The benzylic C–S bond cleaves readily under tribological stress, releasing reactive sulfur that reacts with iron to form a low-shear-strength iron sulfide film, preventing seizure under high contact pressures. DBDS delivers excellent 4-ball EP performance and is commonly blended with phosphorus-based antiwear additives in GL-5 gear oil packages.
المواصفات الفنية
| purity | ≥99.0 wt% |
| appearance | White to off-white crystalline solid or flakes |
| melting point | 70–72 °C |
| sulfur content | 25.0–26.5 wt% |
| 4-ball weld load | >315 kgf |
| flash point (COC) | >180 °C |
مجالات التطبيق
- GL-5 hypoid gear oils for rear axles and limited-slip differentials
- Extreme pressure industrial gear oils and compressor oils
- Cutting oils and metalworking fluids for heavy-duty machining
- Wire drawing and metal forming lubricants
- Grease formulations requiring high EP performance
مميزات المنتج
- High-purity crystalline product with well-defined sulfur reactivity for consistent EP performance
- Excellent 4-ball weld load performance in gear oil and metalworking fluid applications
- Readily soluble in mineral and synthetic base oils, including PAO and ester-based lubricants
- Synergizes with phosphorus-based additives (ZDDP, TCP) for balanced EP-antiwear formulations
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