Distinguishing the Difference Between a Metal O.D. and Rubber-Covered Seal

摘要

Most Shaft seals are typically placed in bores made of steel, cast iron or other common ferrous metallic material. These ferrous or iron-containing materials are compatible with both metal-cased and rubber-covered seals.. On the other hand, bores made of non-ferrous materials or softer alloys like aluminum require special consideration, especially when subjected to temperature extremes. For instance, when a shaft seal with a carbon steel-case is fitted to a bore made of aluminum and exposed to high temperatures, the result is a loose fit and seal failure. This is because of the differential rates of thermal expansion between the steel cased seal and the aluminum housing.