O-ring
Gasket
Item
No:ZD-G2090
Description:An
O-ring
is a round
ring
that is used as a gasket for sealing a connection.
They
are typically constructed out of
polyurethane, silicone, neoprene, nitrile rubber or fluorocarbon.
They
are designed to be seated in a groove or housing that keeps the
ring
in place. Once in its track, the
ring
is compressed between the two pieces and, in turn, creates a strong seal
where they meet.The seal that a rubber or plastic
O-ring
creates can either exist in a motionless joint, such as between piping,
or a movable joint, such as a hydraulic
cylinder. However, movable joints often require that the
O-ring
be lubricated. In a moving enclosure this ensures slower deterioration
of the
O-ring
and therefore, extends the useful life of the product.O-rings
are both inexpensive and simple in design and are therefore very popular
in manufacturing and industry. If mounted correctly,
O-rings
can withstand a very large amount of pressure and are therefore used in
many applications where leaks or loss of pressure are unacceptable. For
instance,
O-rings
used inhydraulic cylinders prevent
leakage of hydraulic fluid and allow for the system to create and
withstand the pressures required for operation.O-rings
are even used in highly technical construction such as space ships and
other aircraft.
The Invention & Development of O-ring:A faulty
O-ring
was deemed the cause of the Space Shuttle
Challenger catastrophe in 1986. An
O-ring
used in the manufacture of the solid
rocketbooster did not seal as expected due to the cold weather
conditions upon launch. Consequently, the ship exploded after only 73
seconds into flight. This highlights the importance of the
O-ring
as well as its versatility.Of course, different types of
O-rings
made out of different materials are used for various tasks. The
O-ring
needs to be matched to its application. Do not confuse however, similar
inventions that are not round. These objects are brother to the
O-ring
and are instead simply called seals.
Application Non-metalic O-ring:These
rings are commonly used in mechanical applications, such as pipe
connections, and help to ensure a tight seal between two objects.
Standard O-Ring Materials and
applications:
|
Material |
General Properties |
Common Applications |
|
Buna-N
(Nitrile / NBR)
70 Durometer Black |
Good resistance
topetroleum,hydrocarbons, fuels.Widely used
with most oils, hydraulic fluids,
alcohol.Poor resistance to sunlight,
weathering and ozone.Many
compound variations for specific
applications.The
least expensive most readily available
material.
Basic temperature range: -40 F to +250 F* |
Petroleum Oil Seals
Hydraulic Fluid Seals
Water / Greases
Transmission Fluid Seals |
Viton?/small>
(Fluorocarbon)
75 Durometer Black |
Excellent temperature and
chemical resistance.
Excellent mechanical and physical
properties.
Low compression set and low gas
permeability.
Not for use with Acetone, Skydrol, or ethyl
Acetate.
Basic temperature range: -20 F to +400 F* |
Vacuum Seals
Many Acids and Fuels Heat Resistance
Many Chemicals
Many Solvents |
Silicone
70 Durometer Red/Orange |
Broad temperature range.
Odorless / non-toxic.
Resistance to sun and ozone. Fungus
resistance.
Poor tear and abrasion strength.
Poor resistance to oils.
Basic temperature range: -80 F to +400 F* |
Dry heat
Alcohol / Oxygen
Electrical / Medical
Low Temperature |
EPDM / EPR
(Ethylene Propylene)
70 Durometer Black |
Resistance to sunlight,
weathering and ozone.
Poor resistance to petroleum oils and fuel.
Good heat and compression set resistance.
Basic temperature range: -65 F to +250 F* |
Steam / Hot water
Hydraulic / Skydrol
Some Chemicals
Auto Brake Systems
Alcohol / Greases |
Neoprene
(Chloroprene) |
Good resistance to petroleum
oils.
Low compression set and good abrasion
strength..
Good resistance to weathering, sunlight and
ozone.
Basic temperature range: -40 F to +225 F* |
Refrigeration Seals
Freon / Air Conditioning
Motor Mounts
Engine Coolants |
|
Fluorosilicone
|
Wide range of fluid and
chemical resistance.
Large temperature range.
A blend of Viton?/small> and Silicone.
Basic temperature range: -80
F to +350 F* |
Aircraft fuel systems
Jet Fuel / Gasoline
Petroleum Oils
Synthetic Jet Oil |
Urethane
(polyurethane)
|
Available in High and Low Grades
Excellent wear/abrasion and extrusion
resistance.
Poor compression set and chemical resistance.
Basic temperature range: -65 F to +225 F* |
High Pressure Hydraulics
Drive Belts |
|
PTFE |
Excellent temperature range.
Various chemical and fuel resistance.
Low coefficient of friction.
Non-elastic.
Basic temperature range: -250 F to +450 F* |
Temperature
Range
Chemicals / Fuels
Non-elastic |
Warning: Gasket materials should
never be recommended when both the
temperature and the pressure are at
the maximums listed. Properties and
applications shown are typical. No
application should be undertaken by
anyone without independent study and
evaluation for suitability. Never
use more than one gasket in one
flange joint, and never reuse a
gasket. Improper use or gasket
selection could cause property
damage and/or serious personal
injury. The data reported is a
compilation of field testing, field
service reports and/or in-house
testing. While the utmost care has
gone into publishing the information
contained herein, we assume no
responsibility for errors. The
information and specifications
contained in this website are
subject to change without notice.
This revision cancels and obsoletes
all previous editions.
