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Small Business
Veteran-Owned
ITAR
Registered
ISO 9001:2008
AS9100:2004
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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. |
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Sealing Devices Inc.