These seals are made out of a nitrile rubber compound to make for better sealing and compatibility with synthetic oils. Their design has a beaded rubber outside diameter to prevent spring back during assembly and for better overall sealing, and a secondary dust lip keeps out contaminants. They come in ISO 6194 and DIN 3760 dimensions up to 250 mm shaft sizes, and they work in -40 to 212F (-40 to 100C) temperature ranges. They are built for industrial applications such as gearboxes containing grease or synthetic oil lubricants. SKFhttp://rbi.ims.ca/4928-607
As manufacturers add new technologies to their products, designing for compliance becomes more difficult. Prepare for the certification testing process. Otherwise, you increase the risk of discovering a safety issue after a product leaves the assembly line. That will cause significant time-to-market delays, be much costlier to fix, and damage your brand in the eyes of customers.
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