A seal's primary functions are to retain the lubricant in the hub and to keep out contaminants, grit and debris. PΛRTSMΛRT seals are thoroughly tested to ensure both functions meet OEM standards. Each design incorporates flexible exclusion lips to keep out contaminants and have bi-directional helix (hydrodynamic pumping features) on the air side of the main sealing lip to help "pump" lubricant back into the hub during operation. Seals are life tested on accelerated life test stands to verify that production design integrity is met. Factory selection includes a verification of Quality Certifications (ISO9001 / QS9000 / TS16949).
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