Namura compression rings are composed of either a highly ductile cast iron or stainless steel alloy; both possess excellent wear resistance and provide a gastight seal. Chrome, phosphate and nitride coatings are also used to meet the demands of the application.Oil rings consist of 3 separate components. 2 scraper rails constructed from highly ductile cast iron or a stainless steel alloy and also have a chrome, nitride, or phosphate coating. The single expansion ring is manufactured from stainless steel.
