The is a specific technical designation that frequently appears in industrial filtration, pneumatic systems, and specialized automotive components. While it may sound like a generic alphanumeric code, it represents a critical standard for high-performance fluid and air management.
| Feature | Standard Rubber Wiper (NBR) | PTFE Wiper | | | :--- | :--- | :--- | :--- | | Hardness | 70-80 Shore A | 55-65 Shore D | 95 Shore A | | Abrasion Resistance | Fair | Poor (softens) | Excellent | | Low Temp Flexibility | Good | Poor (stiff) | Very Good | | Extrusion Resistance | Low | High | Very High | | Cost | Low | High | Medium | | Best Use Case | Clean indoor hydraulics | High temp / Chem aggressive | Dirty, abrasive outdoors | wunf 400