Zinc Dialkyldithiophosphate (ZDDP)
Zinc dialkyldithiophosphate (ZDDP) is the cornerstone multifunctional additive in engine oil formulations, delivering simultaneous antiwear, extreme-pressure, and antioxidant performance. It forms a protective tribofilm on metal surfaces under boundary lubrication conditions, dramatically extending component life. Widely specified in API SN/SP, ACEA A3/B4, and OEM-approved passenger car and heavy-duty engine oil packages.
Technical Specifications
| appearance | Amber to dark amber liquid |
| zinc content | 8.5–9.5 wt% |
| sulfur content | 14.0–16.0 wt% |
| flash point (COC) | >140 °C |
| phosphorus content | 7.2–8.0 wt% |
| kinematic viscosity (100°C) | 15–25 mm²/s |
Applications
- Passenger car motor oils (PCMO) meeting API SN/SP specifications
- Heavy-duty diesel engine oils (HDEO) for CK-4/FA-4 formulations
- Gear oils and automatic transmission fluids requiring antiwear protection
- Industrial hydraulic fluids needing antioxidant and antiwear performance
- Motorcycle engine oils and racing lubricants
Key Features
- Triple-function performance: antiwear, extreme pressure, and antioxidation in one molecule
- Proven tribofilm formation on ferrous and non-ferrous surfaces under high-load conditions
- Excellent thermal and hydrolytic stability for extended drain interval formulations
- Compatible with most base oils and co-additives used in modern engine oil packages
Send Inquiry
More in Anti-Wear Agents
API CK-4 Heavy-Duty Diesel Engine Oil Additive Package
API SN/SP Passenger Car Engine Oil Additive Package
Alkylated Diphenylamine (ADPA) Antioxidant
Amine Phosphate Antiwear Additive
Aromatic Seal Swell and Conditioner Additive
Automatic Transmission Fluid (ATF) Additive Package
Barium Dinonylnaphthalene Sulfonate Rust Inhibitor
Calcium Complex Soap Grease Thickener