An O-ring
is a gasket that is designed to be mechanical in nature using a loop of
elastomer-shaped material in a round design. The o-ring is intended to provide
a seal between two or three separate sections where it is fitted between said
sections, compresses and provides an air tight seal.
O-rings
are typically fitted during assembly rather than after a product has been
completed. They may on occasion be fitted after the finished product has been
completed, but in most cases this is done during maintenance to replace a tired
o-ring rather than as a fundamental change in sealing methodology.
Machine
design is replete with the use of o-rings because they are a simple sealing
mechanism often using inexpensive materials, easy to fit, tending to be
reliable over reasonable periods of time and capable of handling many thousands
of psi of pressure.
O-Ring
History
O-rings
themselves are not a new invention, actually coming from Sweden back in 1896.
Early use of O-rings include being part of the braking system for street trams.
O-rings methodologies were also used by the US government for the manufacturing
effort during World War II.
Materials
O-Ring
kits can be made of many different types of materials. Therefore, not all
o-rings use the same material or possess the same properties. For this reason
it should be understood that the failure of one type of o-ring does not suggest
a fundamental failure in design; usually the case is a limitation with the
material used in the o-ring kit itself.
Over
twenty different materials have been used over the years in the manufacturer of
o-ring kits. Synthetic rubbers are often used and thermoplastics have been
utilised in a few different types such as thermoplastic elastomer.
Each
material has positives and negatives, so it is important to purchase an o-ring
kit that suits the right needs. Some materials being brittle or fail to
expand/contract at freezing temperatures or at high temperatures; others are
susceptible to ozone gases, poor weather, age, oils or fuel substances.
For this
reason, it is important to determine the use for a particular kit as no one
type of material used in o-ring manufacturer is suitable for all possible
applications; especially those unintended at the time of purchase.
O-Ring Kit
Availability
O-ring kits are
available for many different o-ring sizes and material combinations. Choose the
kit that is right for the purpose it is intended for the best sealing results.
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