Case Study - Chemical-Resistant Grease for EGR Valves
Background
Vehicle emission control systems such as exhaust gas recirculation (EGR) systems play an important role in ensuring vehicles comply with safety and emission regulations. To ensure optimum performance, EGR valves and other components must operate reliably under harsh underhood conditions. To do this, these applications require lubricants that can withstand extreme temperatures and exposure to fuels and emissions. A leader in EGR design approached Nye to find a lubricant for their EGR valve bearings and plastic actuator gears that would pass durability testing.
Challenge:
- Can the lubricant meet low temperature safety requirements and withstand high underhood temperatures?
- Can the lubricant resist hydrocarbon emissions, exhaust fuels, and other chemicals?
- Can Nye provide a grease that is compatible with the plastics and elastomers of the application?
Solution
Uniflor™ 8921 & Uniflor™ 8472
Chemically inert, PFPE lubricants thickened with PTFE.
- Consistent performance at low & high temperatures
- Resists chemicals, fuels, and exhaust
- Compatible with plastics & elastomers
- Prevents wear, extends component life
| Grease | Temperature Range |
NLGI Grade | Viscosity Index |
|---|---|---|---|
| UNIFLOR 8921 | -65 to 250 °C | 2 | 334 |
| UNIFLOR 8472 | -50 to 225 °C | 2 | 221 |
Results
Uniflor™ 8921 and Uniflor™ 8472 both have a high viscosity index which means that the grease maintains its viscosity as temperature changes. Lubricants with a high VI are more stable, last longer, and require less lubricant per part. Ultimately, Nye recommended that the OEM use Uniflor™ 8921 for their valve bearings and Uniflor™ 8472 for their actuator gears after our products passed their durability testing. The customer was pleased with our technical support and range of products and now considers Uniflor™ 8472 their “go-to” grease for plastic gearing.
Want to learn more? Contact Us.
