Sealing Devices Inc.
 

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Small Business
Veteran-Owned
ITAR Registered
ISO 9001:2008
AS9100:2004

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o-rings
Home > O-Rings
 
 

o-rings, Orings

Parker O-Rings
Sealing Devices is Proud to Offer Parker Seal O-Rings.
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 'common' size stock materials, or can be custom made to fit into highly engineered glands. When an oring 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, flourocarbon rubber, nitrile rubber (NBR), butadiene rubber, chloroprene rubber, and perflourinated elastomers. Many sizes are available to fit most sealing applications, and they can be chosen from the Parker O-Ring Handbook. There is also a useful chemical compatibility chart that compares several different elastomeric compounds, and displays each compounds chemical resistance to commonly used materials.

The 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 oring 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. The different durometer specifications can be determined by consulting the Parker O-Ring Handbook.
   
 
 
o-rings
 


SD Sealing Devices Inc.
4400 Walden Ave. Lancaster, NY 14086

Tel: 716.684.7600   Fax: 716.684.0760
E-mail: seals@sealingdevices.com      © 2010 Sealing Devices Inc.

ISO 9001 2000 Certified    VISA MASTERCARD ACCEPTED