Aflas® is the trade name (Asahi Glass Co.)
for a non-conventional fluoroelastomer (FKM) material which
has a different chemical structure than other fluoroelastomers.
It is considered a "cousin" of the fluoroelastomers,
but offers significant advantages over them. Aflas® exhibits
excellent heat resistance; 3 months @ 446F, 30 days @ 500F
and intermittent tolerance @ +572F. It also offers excellent
chemical resistance to high concentrations of acids, alkali
and oxidants under high temperatures. In addition, it offers
exceptional electrical insulation properties, similar to those
of Silicone and EPDM rubber. Aflas® is primarily used
for automotive oil sealing components.
Butyl, also known as isobutylene isoprene, has exceptional
resistance to gas permeation, along with excellent water and
steam resistance. Butyl has a temperature range of -65F to
+200F. For most Oring applications, Ethylene Propylene (EP)
has replaced Butyl due to similar properties, but with better
heat and compression set resistance.
Chloroprene (Neoprene®) was one of the first synthetic
materials developed as an air-oil resistant substitute for
Natural Rubber. It has the unusual characteristic of being
resistant to both petroleum lubricants and oxygen over a temperature
range of -40F to +225F. It also provides good resilience and
NEOPRENE 70 Durometer, Black Color
Epichlorohydrin, Hydrin® (ECO):
Hydrin® is a specialty compound, acceptable for use
over a temperature range of -40F to + 275F. This compound
combines good petroleum oil and fuel resistance, with good
resistance to sunlight, ozone and weathering. Hydrin®
has good chemical resistance, but may be corrosive to adjacent
metal parts. It is frequently used for fuel and oil seals
which may be exposed to weather.
Ethylene Acrylic, Vamac® (AEM):
Ethylene acrylic (Vamac®) is a specialty Dupont-Dow
Elastomer offering a temperature range of -40F to +300F. It
provides low temperature flexibility for automotive applications
including automatic transmission seals, power steering seals
and gear box seals. It also exhibits excellent resistance
to weathering, ozone and air aging.
Ethylene Propylene, EPDM, or EP (EP):
EP is a copolymer of ethylene and propylene, while EPDM
is a terpolymer combining ethylene, propylene and a diene
monomer. EP materials offer a temperature range of -65F to
+300F and offer excellent resistance to ozone, weathering,
steam, water and phosphate ester type hydraulic fluids. EP
can be manufactured to conform to FDA requirements, making
it ideal for use with foods and medical devices.
EPDM 70 Durometer, FDA Grade
Fluorocarbon, VITON® (FKM):
VITON® is the trade name for DuPont-Dow Elastomers
Fluorocarbon or FKM material. VITON® has a temperature
range of -20F to +400F, and provides excellent resistance
to a wide variety of chemicals, weather and compression set
requirements. The relatively high level of fluorine in VITON®
materials allows for exceptional resistance to chemical attack,
but with limited low temperature capabilities. Intermittent
exposure to +600F can be tolerated for brief periods of time.
Many industrial products are now switching to Orings made
of VITON®, making it the most significant elastomer development
in 50 years.
Viton 75 Durometer, Black color
Viton 75 Durometer, Brown color
V768-75 FDA & 3A Sanitary Grade Viton 75 Durometer, Brown Color
Fluorosilicone combine the best properties of fluorocarbons
and silicones. Fluorosilicone resist solvents, fuel and oil
(similar to Viton®); but also provide stability over a
broad temperature range of -100F to +350F. This elastomer
is frequently used in aircraft fuel systems. However, it is
limited to static seal applications due to poor tear resistance.
F900-70 Fluorosilicone 70 Durometer, Blue Color
Hydrogenated Nitrile, HNBR:
HNBR, sometimes referred to as Highly Saturated Nitrile
(HSN), offers a temperature range of -25F to +350F. HNBR is
often used in automotive refrigeration systems using Freon
134A, and in power steering seals using Type A Fluid. To manufacture
HNBR, Nitrile is first dissolved in a solvent, then a catalyst
is used and hydrogen gas hydrogenates the Nitrile. While HNBR
is in the Nitrile family, it undergoes this extensive, and
consequently expensive, process to become HNBR.
HNBR70 Durometer, Green color
HNBR70B Durometer, Black color
Nitrile, Buna-N (NBR):
Nitrile, also known as Buna-N or NBR, is a copolymer of
Butadiene and Acrylonitirle. It is the most commonly used
elastomer for sealing products. It has a temperature range
of -40F to +250F and is exceptionally resistant to petroleum
base oils and hydrocarbon fuels. Nitrile materials also exhibit
excellent tensile strength and abrasion resistance properties.
The material performs well with most dilute acids, silicone
oils and lubricants and in water applications. It is not recommended
for use with ketones, aromatic hydrocarbons and phosphate
ester hydraulic fluids. Ozone resistant Nitriles are recommended
where extended exposure to air and ozone are anticipated.
More than 50% of the Orings sold are Nitrile Orings, commonly
used in hydraulic/pneumatic motors, cylinders, pumps and valves.
Nitrile (Buna-N) 70 Durometer
FDA Nitrile (Buna-N) 70 Durometer
Nitrile (Buna-N) 90 Durometer
Perfluoroelastomers combine the chemical resistance of
Teflon with the elasticity of Viton to make a fully fluorinated polymer with
superior chemical resistance over traditional elastomers. Saturation by
Fluorine along the polymer backbone provides exceptional immunity from chemical
attack and temperature range from -25F to +590F. These compounds are usually
used in high temperature or caustic chemical applications where traditional
elastomers degrade or show reduced product life.
Polyacrylate offers a broad temperature range of -20F
to +350F. Often used in automobile transmissions and power
steering seals using Type A Fluid, it has excellent resistance
to petroleum fuel and oils. It also exhibits good ozone and
oxidation resistance, as well as good flex cracking resistance.
Polyacrylate 70 Durometer, Black color
Polyurethane (AU / AE):
Polyurethane compounds offer exceptional abrasion and
wear resistance and are offered in two distinctively different
variations. For use in oil, use a polyester type which has low volume swell, but softens dramatically
when exposed to water. For water sealing applications, use
the polyether type which retains its integrity
in water, but swells significantly when exposed to oil. A
hybrid version that is acceptable for both applications is
available at a substantially higher cost.
Polytetrafluoroethylene, Teflon ® (FEP):
Polytetrafluoroethylene is a completely fluorinated polymer that is the most
chemically resistant polymer available. PTFE can withstand a very wide temperature
range from -300F to +500F. It is inert to most chemicals and solvents with very
few substances that degrade the material (notably fluorine, chlorine trifluoride
and molten alkali metal solutions) PTFE is also very slippery and repels
virtually everything making it perfect for applications that require a high
coefficient of friction. PTFE is not crossed-linked like a regular elastomer
and therefore has poor elastic memory, can deform under constant compressive
load and can be damaged during installation.
Silicone materials offer outstanding temperature resistance
across a broad range, from -80F to +400F. Silicone materials
provide excellent resistance to sunlight, ozone, oxygen, UV
light and moisture. It's inert qualities make it the preferred
material for use with food handling and medical applications.
Silicones offers poor tensile, tear and abrasion resistance,
and are not reccommended for use in dynamic applications.
Silicone 70 Durometer, FDA Grade
SBR, styrene butadiene, or Buna-S, was originally developed
to replace natural rubber in tires. While sometimes used for
automobile brake system seals, it has been replaced in most
applications by Ethylene Propylene which offers superior heat
and compression set resistance.
UltraSlip® is SPEC SEALS' proprietary internal-lubricant
for Nitrile (Buna-N) and Ethylene Propylene (EP or EPDM) Oring
compounds. It was developed for use in applications where
incredibly low breakout friction and low running friction
are required. This specially formulated internal-lubricant
provides the lowest coefficient of friction for any Oring
when compared to compounds filled with Teflon, moly-disulfide,
silicone or wax. It also conforms to FDA per CFR 177.2600.