In high-load dynamic environments, material degradation is the leading cause of seal failure. The baseline NBR compound offers decent abrasion resistance but quickly hardens and cracks above 100°C. This CFKS seal utilizes a premium Viton/FKM fluoroelastomer matrix, providing exceptional thermal tolerance up to 220°C and resistance to aggressive additives found in modern heavy-duty lubricants. FKM’s tight molecular structure preserves elasticity, reduces swell in synthetic oils, and drastically lowers lip wear rates under high sliding velocities.

Maximizing seal longevity requires correct seating during assembly to prevent radial distortional stress. The 120*136*18 UR design features a rigid outer casing that ensures consistent interference fit inside the housing bore without tilt. Maintenance intervals are significantly extended thanks to the low-friction lip geometry, which mitigates heat buildup along the shaft contact band. For replacement cycles, ensure the shaft surface roughness meets standard RMS finish criteria and lubricate the seal lip prior to press-fitting to eliminate dry-running friction during initial startup.