Using sealed bearings
Using sealed bearings in housings with standard seals is a good solution for highly contaminated environments. The sealed bearing together with the housing seal and grease provide three layers of protection (SKF Three-Barrier Solution).
SNL and SE housings can be used together with SKF sealed self-aligning bearings. When using taconite seals, a sealed bearing does not enhance the sealing effect during operation, but still protects the bearing against contaminants during mounting.