When
choosing an “O”-ring there are several factors to
consider in determining proper selection including:
the application for which the “O”-ring is to be
used; the media to be sealed; the size of the
fastener to be sealed; and the temperature and
pressure to which the “O” ring will be subjected.
Once each of these factors has been considered and
an “O” ring has been chosen, engineering
calculations should either be checked manually or
by using “O” ring selection software.
Materials
Our
customers can choose from six basic materials which
come in durometer ranges from 60-70 hardness
depending on the chosen material. In addition to
the materials listed below, other materials are
available upon request.
Temperature
Range Chart
(Click to Enlarge)
Comparative
Properties
of Typical Elastomers
(Click to Enlarge)
ETHYLENE PROPYLENE (EPDM)
Our
EPDM compounds are commonly used in outdoor
environments and are excellent for weather &
water resistant applications/appliances having
excellent ozone, steam and chemical resistance.
The standard temperature range for EPDM ranges from –54°C
to 107°C and –65°F to 225°F.
Other temperature ranges available upon request.
BUNA- N (Nitrile)
Our
Buna-N compound is the most common seal material
chosen by our customers because of its versatile
resistance to petroleum-based substances, water and alcohols.
The standard temperature range for Buna-N is
from –40°C to 107°C and
-40°F to 225°F.
Other temperature ranges available upon request.
NEOPRENE (Chloroprene)
Our
neoprene compounds are commonly used in the
refrigeration industry for their resistance to
ammonia and freon. Neoprene is also used for
numerous applications in the automotive industry
because of its excellent resistance to oil.
Resistance to ozone, sunlight and oxygen also
make this a great choice for products exposed to
adverse weather conditions. The standard
temperature range for neoprene ranges from -40°C
to 107°C and –40°F to 225°F.
Other temperature ranges available upon request.
SILICONE
Our
silicone rubber has an excellent temperature
range and can withstand low temperatures without
becoming brittle. However, it is usually
not recommended for dynamic seals because it
does not have optimal solvent or oil resistance.
The standard temperature range for silicone is
from -62°C
to 204°C and -80°F to 400°F.
Other temperature ranges available upon request.
FLUOROSILICONE
Our
fluorosilicone compounds are commonly used in
the automotive and aerospace industries because
of their excellent fuel, oil and solvent
resistance. The standard temperature range for fluorosilicone is from –55°C to 177°C and
–67°F to 350°F.
Other temperature ranges available upon request.
FLUOROCARBON (VITON)
Our
Viton compounds are the preferred choice when
seals are required for aircraft engines and
automotive fuel handling because of its
excellent resistance to high temperatures and
harsh chemicals. The standard temperature range for Viton is from –29°C TO 204°C and –20°F
to 400°F.
Other temperature ranges available upon request.
Any
application of an elastomer in an environment with
temperatures near its extreme cold or hot limit
should be tested to assure performance.
MILSPEC “O” RINGS
ZāGO
Manufacturing offers military standard “O”-Rings
which meet the following military specs:
General Purpose Buna N
Buna
N - Mil P 5315
Buna
N – Mil P 25732
Buna
N – Mil R 6855
Ethylene Propylene
Fluorosilicone – Mil R 25988 TY 1 CL 1
Silicone – ZZR 765 CL 2A or 2B
Fluorocarbon (Viton) – MIL R 83248 CL 1
Brown Viton
Neoprene
Teflon AMS 3652
FDA-Approved
“O” Rings
ZāGO can
provide the following FDA approved “O” Rings:
