*Offer valid 12/26/16-12/30/16 while supplies last at participating Hallmark Gold Crown stores in the U.S.A. and at Hallmark.com. Discount will be taken on equal or lesser-valued item. Not valid on past purchases. Hallmark.com orders require U.S. billing and shipping addresses.
Depending on the application and the designof the seal, the material used may be nitrile, polyacrylate, fluoroelastomer(Viton), silicone, nylon or TeflonÂ¨. Nitrile is one of theleast expensive materials, and has been used for many years inumbrella or deflector type seals for older pushrod engines.
The most common types of rubber o-rings include viton o-rings, teflon o-rings, neoprene o-rings, silicone o-rings and nitrile o-rings. Some of these plastic materials create clear o-rings, particularly the silicone base. The food and medical fields use the clear o-rings often. Metal o-rings are also widely available. Nitrile O-rings are by far the most popular type of seal material used in the world. 2  Nitrile o-rings are carbon triple-bonded to nitrogen, which provides good resistance to oils and fuels. 3  O-ring kits are sets of o-rings that are designed to replace faulty o-rings.