Power Steering Fluid (PSF) Additive Package
Power steering fluid (PSF) additive packages are formulated to meet the demanding requirements of hydraulic power steering systems, including antiwear protection for the pump and rack components, seal compatibility with multiple elastomer materials, oxidative stability, and effective operation across a wide temperature range (-40°C to +150°C). These packages also address the requirements of modern electric power steering (EPS) reservoir fluids and column-type EPS fluids, where low viscosity and electrical insulation properties are added requirements.
Technical Specifications
| appearance | Clear to amber liquid |
| flash point | >170 °C |
| TBN of package | 15–50 mg KOH/g |
| kinematic viscosity (100°C) | 5–15 mm²/s (finished fluid) |
| pour point of finished fluid | <-40 °C |
| treat rate in finished fluid | 4–8 wt% |
Applications
- Hydraulic power steering fluid for passenger cars and light trucks
- Electric power steering reservoir and column fluids
- Power steering fluid meeting GM, Ford, Honda, and Toyota OEM specifications
- Heavy truck and bus hydraulic steering system fluids
- All-season power steering fluids with improved low-temperature performance
Key Features
- Multi-material seal compatibility tested against NBR, HNBR, EPDM, and PTFE seal materials
- Excellent low-temperature fluidity (-40°C operation) for cold-climate cold-start steerability
- Antiwear protection prevents vane pump and rack-and-pinion wear in PSF systems
- Low foaming and good demulsibility for clean, efficient power steering hydraulic operation
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