Oil Seals are a good resource for any application where dirt, dust or other foreign matter needs to be sealed out, and or oil or grease sealed in, to protect the bearing on a rotating shaft. These seals usually consist of an outer case made of steel or an elastomer, and a sealing lip made out of an elastomeric or thermoplastic material. Also known as lip or shaft seals, Monroe Seals has a multitude of lip designs to choose from for the endless amount of applications. For more information, please see: Oil Seal Material & Design Guide
Nitrile Buna-N 70 durometer compound is the standard material for our seals and is recommended for a majority of common applications. Nitrile lip seals work well within the temperature range of -65°F to 250°F and provide compatibility with water and most common mineral oil and greases.
Polyacrylate compounds are recommended for higher temperature applications, ranging from -30°F to 300°F. They also work well with mineral oils, EP additives and greases. However, they offer poor sealing in dry running conditions and cost more than Nitrile.
Silicone compounds offer the widest range of normal operating temperatures ranging from -90°F to 340°F. However, they do not perform well in dry running conditions, and should not be used with EP compounds and oxidized oils.
Viton® compounds are premium lip materials offering the widest temperature range and chemical resistance. Viton® will handle temperatures from -40°F to over 400°F (-40°C to over 240°C).
Viton® will resist most special lubricants and chemicals that can destroy Nitrile, Polyacrylates and Silicones. Viton® is extremely resistant to abrasion and provides superior wear performance. Viton® works in dry running applications, but only for intermittent periods. Graphite is available as an additive to any compound. Normally graphite is added at a 3% factor to aid in lubricity.