O-rings and rubber seals
Custom or standard types
Seals are one of Betech's core areas, and we are confident that whatever your needs, we can find a seal that solves the task - whether it is static or dynamic.
The popular O-ring is both the easiest and most versatile rubber seal - used either alone or in conjunction with other types of seals.
Static and dynamic seals
We supply seals in many types, materials and dimensions.
In addition to standard types, Betech offers individually designed seals with special installation dimensions, spring-activated special seals and other specialized solutions for demanding applications:
- O-rings, D-rings and X-rings
- Clamp seals
- Bonded Seals
- Oil seals and V-rings
- Activated PTFE seals
- Braided gaskets and mechanical shaft seals
- Hydraulic and pneumatic seals
Get security of supply with a storage agreement
If your company has a regular need for a certain amount of seals, you can enter into a stock agreement with Betech. This ensures that a minimum stock is always available and you get security of supply for critical productions or emergency jobs.
Get design and construction advice
Consult us during the construction phase. We put our many years of experience at your disposal and are happy to enter into a close dialog about the optimal sealing solution for your specific application.
In addition to consulting, we custom design and manufacture solutions from our extensive range of compound and gasket materials.
O-rings and X-rings - the easy and versatile seals
O-rings are the most widely used type of seal in the world thanks to their simple shape and the small space they require. They are easy to install and are available in countless materials and dimensions. This means that regardless of operating conditions and installation dimensions, you can find an O-ring that meets the requirements of your application. As a result, the O-ring has a very wide range of applications in all branches of the technical industry.
Why is the O-ring so popular?
There are several good reasons why the O-ring has become the most widely used type of seal:
- The O-ring is a simple and cheap solution compared to other types of seals
- The O-ring can be used as a double-acting, compressible seal in both static and dynamic applications
- The O-ring is easy to install as it withstands both compression and stretch
- The O-ring groove is simple to manufacture
- The O-ring can usually be installed without the use of tools
How the O-ring works
When the O-ring is subjected to tension and pressure, its shape changes to fill the O-ring groove and splits. This creates a tight seal that prevents the passage of liquids, gases and contaminant particles.
X-rings provide less friction than O-rings. Where the O-ring is made of a solid rubber cord, the X-ring has an X-shaped cross-section. X-rings are more widely used for dynamic applications where you want lower friction.
O-rings and X-rings can be delivered surface-treated if you want to reduce friction for e.g. automatic assembly.
The O-ring can be used in both static and dynamic applications
O-rings are used both as dynamic and static seals. Lids, flanges and covers are common examples of static applications. Valves, faucets and fittings are examples of the dynamic ones.
The O-ring is also a key sealing part as an activator in hydraulic equipment, but it is NOT recommended that O-rings are used as the only sealing part in dynamic applications with continuous reciprocating (linear) piston movement or continuous rotating shaft movement.
O-rings in static applications
O-rings can be clamped axially and radially in static applications. Installation and retention in dovetail and triangle grooves are also common solutions.
O-ring mounted axially
The O-ring is clamped axially
in the track, in the same way
as a flat gasket.
O-ring mounted in dovetail groove
In a dovetail groove, the O-ring is held in place during use. This is a great advantage when it comes to
applications that frequently
disassemble/open.
O-ring mounted radially
The O-ring clamps radially
between the inner diameter [IDS] and outer diameter [ODS] of the track.
O-ring mounted in triangle groove
This installation is both
Safe, cheap and easy to use.
Product catalog: O-rings
O-rings are used in countless industrial applications such as sealing lids, flanges, covers, valves and fittings. The O-ring often functions as a static seal but can also be part of a dynamic sealing system.
Read about tolerances, installation, track dimensioning, rubber types and technical terms (Danish or English).
Pressure, temperature and media control your choice of sealing material
Pressure, temperature and the nature of the medium are the most important factors when deciding which type of rubber O-ring to use?
The most common rubber types for O-rings are:
NBR
HNBR
Hydrogenated Nitrile Butadiene
HNBR is an improved version of NBR, being more resistant to ozone, weather and heat. The elastomer has good setting properties and good resistance to hydraulic oil, diesel oil, mineral grease and oil additives.
Temperature range: -40 °C to +150 °C,
briefly 180 °C *)
EPDM
Ethylene Propylene Rubber
EPDM rubber has good setting properties, good weather resistance and good resistance to many organic liquids, acids and alkalis. EPDM also withstands water and water vapor, but is not suitable for mineral oil or grease.
Temperature range: -55 °C to +130 °C *)
FPM (FKM)
FFPM (FFKM)
Per fluoroelastomer
This material is the ultimate in elastomers for use with chemicals and high temperatures. FFPM can be explained as a material with the chemical resistance of PTFE and the settling properties of FPM. Due to the material's chemical and temperature resistance, it is
FFPM is the elastomer best suited for long-term use in refineries, the pharmaceutical industry, the chemical industry and the semiconductor industry.
Trademarks: Perlast®, Kalrez®, Chemraz®
Temperature range: -15 °C to +330 °C *)
TFE/P
Tetrafluoroethylene Propylene
TFE/P is a unique fluoroelastomer that especially
is characterized by good vapour resistance. TFE/P also has good chemical resistance to oil-strong acids and bases. In addition, the material is particularly suitable for electrical insulation.
Trademark: Aflas®
Temperature range: -10 °C to +230 °C,
briefly 250 °C *)
FTE
Ethylene / Tetrafluoroethylene / Perfluoromethyl vinyl ether
ETP is a peroxide vulcanized blend of Ethylene, Tetrafluoroethylene (TFE) and Perfluoromethyl Vinyl Ether (PMVE). ETP is particularly suitable for use in the petrochemical industry, where today's fuels contain additives such as MTBE, TAME, ETBE, toluene and alcohol. The elastomer is also resistant to polar solvents, oil, strong acids and bases. ETP is often used as a replacement for TFE/P, as the ETP material is often cheaper and more resistant to chemicals.
Trademarks: Kemex™
Temperature range: -20 °C to +206 °C *)
Q
Silicone
This elastomer is suitable for both high and low temperatures and has a low permanent deformation. However, its tear strength, abrasion resistance and tensile strength are poor, so it should only be used as a static seal. Silicone is resistant to sunlight, ozone, oxygen, UV light and dry heat. Silicone is not resistant to most petroleum-based liquids or ketones, such as MEK and acetone, water vapor and ether. Silicone is not gas-tight. Silicone is tasteless, odorless and completely non-toxic. Silicone is also resistant to bacterial and fungal growth.
Temperature range: -60 °C to +200 °C *)
FVMQ
Fluorosilicone
This fluorine-modified silicone elastomer has most of the properties of silicone, but the oil and fuel resistance is significantly better. It also has good resistance to sunlight, ozone, oxygen, UV light and dry heat. The disadvantages are that the material is not gas-tight, has a low tensile strength and poor tear and abrasion resistance.
Temperature range: -60 °C to +200 °C *)
CR
Chloroprene rubber
CR has good sentence properties and good
resistance to sunlight, ozone, oxygen and weathering. The material is therefore recommended for outdoor use. It is also resistant to mineral grease and some types are resistant to phoron. Less good resistance to hydraulic and diesel oil.
Trademarks: Neoprene®
Temperature range: -30 °C to +90 °C *)
We are ready to advise you
If you didn't find what you were looking for, we are ready to help you find the right solution. The products on these pages are examples from our almost limitless universe of possible product solutions.
