Integrated COMBI Seal for Fine Clay and Coarse Grit

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Integrated COMBI Seal for Fine Clay and Coarse Grit | Particle-Size-Based Mud Exclusion

Mud particle size changes how contamination attacks a seal. Fine clay can migrate into narrow clearances and remain wet against the lip, while coarse sand and grit can cut, wedge and score the shaft. A standard oil seal may not manage both mechanisms well under continuous exposure. The integrated COMBI seal uses staged exclusion barriers to keep different particle sizes away from the primary lubricant-retention lip. For better selection, describe whether the job site has silty clay, sharp sand, gravel-rich slurry or mixed debris, then match the profile with shaft size, hardness, RPM, temperature, pressure and lubricant.
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Description

Mud particle size changes how contamination attacks a seal. Fine clay can migrate into narrow clearances and remain wet against the lip, while coarse sand and grit can cut, wedge and score the shaft. A standard oil seal may not manage both mechanisms well under continuous exposure. The integrated COMBI seal uses staged exclusion barriers to keep different particle sizes away from the primary lubricant-retention lip. For better selection, describe whether the job site has silty clay, sharp sand, gravel-rich slurry or mixed debris, then match the profile with shaft size, hardness, RPM, temperature, pressure and lubricant.

Particle Size Changes the Failure Mechanism

Fine particles migrate; coarse particles abrade. A COMBI seal uses multiple exclusion stages so the dirt side can manage more than one contamination size before debris reaches the primary oil lip.

40+ Product Attributes

1. Product: Integrated COMBI seal
2. Selection basis: Mud particle size
3. Fine contaminant: Silt/clay
4. Medium contaminant: Sand
5. Coarse contaminant: Grit/gravel
6. Motion: Rotary
7. Main function: Oil retention
8. Exclusion function: Multi-stage dirt barrier
9. Fine-particle risk: Migration
10. Coarse-particle risk: Abrasion
11. Oil lip: Dedicated
12. Dirt lips: Multiple
13. Mud resistance: Enhanced
14. Abrasion control: Enhanced
15. Shaft protection: Helps reduce scoring
16. Equipment: Construction/industrial/off-road
17. Positions: Hubs/axles/drives/gearboxes
18. Housing: Press-fit
19. Shaft interface: Design dependent
20. Elastomers: NBR/HNBR/FKM
21. Case: Steel options
22. Spring: Profile dependent
23. Oil compatibility: Verify
24. Grease compatibility: Verify
25. Pressure: Profile specific
26. Speed: Diameter/RPM dependent
27. Temperature: Compound dependent
28. Shaft hardness: Important for coarse grit
29. Shaft finish: Controlled
30. Runout: Within spec
31. Misalignment: Controlled
32. Bore: Clean/burr-free
33. Install: Square press
34. Orientation: Correct sides
35. Reuse: No
36. Inspection: Identify particle tracks
37. Retrofit: Verify space
38. OEM match: Number/sample
39. Custom size: By dimensions
40. QC: Dimension/lip/case
41. Order input: Particle description plus size
42. Life factor: Particle hardness and load

Selection tip: Do not describe every site simply as muddy. Particle size, sharpness and water content determine whether migration, abrasion or packing is the dominant seal threat.