Nylon/Plastic/Rubber is highly resistant to sun, ozone,weathering and aging. It performs well when exposed to oils, fuels and other chemicals. Washers made from this material are mainly used to prevent leaks and distribute pressure. SILICONE RUBBER washers are included in the following charts. This material provides a combination of high strength, resilience, toughness, stability at high temperature ranges and resistance to a multitude of chemical elements. METAL BONDED-Nylon/Plastic/Rubber washers,bonded to Steel and Stainless Steel Conical Washers, are also available.