FKM and HSN Materials for Diesel Engine Cylinder Liner Seals

Diesel engine cylinder liner seals present an application environment difficult for many seal elastomers. These cylinder liner seals must resist high temperature oil from the crank case as well as water based coolants. High performance Nitrile materials have found application in this area due to their resistance to oil and to water and steam. However, Nitriles lack the long term heat resistance for long mileage applications in hotter running engines. Fluorocarbons generally have excellent resistance to oil and high temperatures but suffer from poor long term resistance to steam and water.

This paper discusses Fluorocarbons recently developed with greatly improved steam resistance along with compression set resistant Highly Saturated Nitriles for these cylinder liner seal applications. Accelerated testing in application environments as well as methods for selecting the best material for the cylinder liner seal application will be discussed.