O-Rings

Parker O-Rings provide superior fluid sealing.

Sealing Devices offers o-rings and seals from Parker Seal to help seal applications against fluids/liquids and gas loss. O-rings are available as standard or metric and are often available from inventory.  They can be custom made to fit into your highly engineered glands. When an o-ring is applied to a properly designed gland, it will seal against a variety of high temperatures, cryogenic conditions, and chemicals. Although o-rings and seals can be used in a variety of static and dynamic applications, they can also complement gaskets and other sealing devices. Most o-rings are made of elastomers including buna rubber, silicone rubber, fluorocarbon rubber, nitrile rubber (NBR), butadiene rubber, chloroprene rubber, and fluoronated elastomers. Many sizes are available to fit most sealing applications using the Parker O-Ring Handbook.

The o-ring chemical compatibility chart compares different elastomeric compounds, and highlights various compounds resistance to different chemicals. The Parker O-ring handbook also lists a comparison of common properties of commonly used elastomers including Aflas, Butadiene, Butyl, Chlorinated Polyethelene, Epichlorohyrdin, Ethylene Acrylic, Ethylene Polypropylene, Fluorocarbon, Fluorosilicone, Isoprene, Neoprene, HNBR, Nitrile, Perfluoroeleastomers, Polyacrylate, polysulfide, polyurethane, SBR and silicone rubbers.

An important consideration for designing o-rings and seals is compression set, or the amount that an elastomer returns to its original thickness after having been compressed. Factors critical to compression set include the amount of squeeze over time, temperature variations, and fluid contact.

The most important criteria in choosing an O-ring include:

Compatibility between the o-rings and the fluid to be sealed.

Operating temperature (or a range of temperatures) are important when designing the gland to be sealed. A gland operating at a high temperature could require increase volume to compensate for the thermal expansion or swelling of the o-ring. Conversely, when low temperature sealing is required, a more shallow gland depth might result in producing the proper squeeze for an effective seal.

Pressure is important in determining the hardness, or durometer of an o-ring. Durometer specifications can be determined by consulting the Parker O-Ring Handbook.  Sealing Devices offers a full line of Parker Seal o-rings, stat-o-seals (fastener seals), lathe cuts, packing, extruded seals, molded shapes, seals and tubing.  Let us provide o-rings to seal your application.