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Most common SEALS used in Hydraulics
by camilohrueda on Oct 4, 2009
In hydraulics, all the components have internal cavities that are sealed mostly by metal to metal contact, because a little internal leak is allowed for lubrication purposes, but in other cases the leak should be zero, for example in cylinders or in pumps to avoid external leakage. The use of elastomers or flexible materials is mandatory. The following is a summary of the most used materials for sealing purposes in hydraulics. BUNA N (Nitrile or NBR). It is perhaps the material most commonly used in all the hydraulic applications, is a material relatively cheap. It is a copolymer of butadiene and acrylonitrile. It is excellent with hydraulic fluids that are based in petroleum. Good low temperature resistance. Rank of temperature of -65 0F to +245 0F, good compression set, flow in cold, cut and abrasion. It has low resistance to ozone, sunlight, and weather. Recommended Fluids: • Fluids based on petroleum. • Water....Read More >>
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