A high-performance, oil-soluble sulfur-based extreme pressure (EP) and anti-wear additive.

Key Features
| Application | Recommended Dosage |
| Vehicle/industrial gear oils | 1.2~2.0% |
| Anti-wear hydraulic & industrial oils | 0.25~1.0% |
| Lubricating greases | 1.0–1.5% |
| Metalworking fluids | 1.0–5.0% |
| Item | Quality Index | Test Method |
| Appearance | Light yellow to reddish-brown transparent liquid | Visual Inspection |
| Density(20℃), kg/m3 | 980~1150 | GB/T1884 |
| Kinematic Viscosity(100℃), mm2/s | 45~70 | GB/T265 |
| Flash Point(Open Cup), ℃ | ≥100 | GB/T3536 |
| Oil Solubility | Transparent without precipitation | Visual Inspection |
| Sulfur Content, m/m % | 35~40 | SH/T0303 |
| Copper Corrosion(121℃*3h), Grade | ≤1 | GB/T5096 |
| Four-ball Machine Experiment, PD/N | ≥600 | GB/T3142 |
Note: Test baseline: 5% T321A + 57% 150BS + 38% 500N (by mass).