Custom-made or standard types
Seals are one of Betech’s core areas, and we are quite 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 at the same time the easiest and most versatile rubber seal – and is used either alone or in conjunction with other types of seals.
We supply seals in many types, materials and in countless dimensions.
In addition to standard types, Betech offers seals in individual designs, with special installation dimensions, as well as spring-activated special seals and other specialized solutions for demanding applications:
If your company regularly needs a certain amount of seals, you can enter into a stocking agreement with Betech. This ensures that there is always a minimum stock available and you are assured of supplies for critical productions or urgent tasks.
Engage us in the design phase. We bring our many years of experience to your disposal and are happy to engage in close dialogue about the optimal sealing solution for your specific task.
In addition to consulting, we also design and manufacture the solutions from our comprehensive range of compound and packing materials.
O-rings are the world's most commonly used sealing type thanks to their simple shape and the small space they require. They are easy to install and come in countless materials and sizes. This means that regardless of operating conditions and installation requirements, you can find an O-ring that meets the requirements you and your application set. Therefore, 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 commonly used sealing type:
When the O-ring is subjected to tension and pressure, its shape changes, filling the O-ring groove and gaps. In this way, a tight seal is achieved that prevents the passage of liquids, air-borne particles and pollutants.
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 used more extensively for dynamic applications where you want lower friction.
O-rings and X-rings can be supplied with a surface treatment if you want to reduce friction, for example when assembling them automatically.
O-rings are used both as dynamic and static seals. Flanges, caps and covers are common examples of static applications. Valves, water taps and fixtures are examples of dynamic applications.
The O-ring is also a central sealing part that acts as an actuator in hydraulic equipment., However, it cannot be recommended that O-rings be used alone as the only sealing component in dynamic applications. with continuous forward and backward (linear) piston movement or continuous rotating shaft movement.
O-rings can be clamped axially and radially in static applications. Embedding and retention in dovetail and triangle grooves are also common solutions.
O-ring mounted axially
The O-ring is clamped axially in the groove, in the same way as a flat gasket.
O-ring mounted in the snorkel groove
In a snorkel case, the O-ring is held in place during use. This is a major advantage when it comes to applications that are frequently disassembled/opened.
The O-ring mounted radially
The O-ring is clamped radially between the inner diameter [IDS] and outer diameter [ODS] of the groove.
The O-ring mounted in the triangular groove
This integration is both safe, inexpensive, and easy to use.
O-rings are used in countless industrial applications, e.g. for sealing lids, flanges, covers, valves and fittings. The O-ring most often serves as a static seal, but it can also be part of a dynamic sealing system. Read about tolerances, installation, track dimensions, rubber types, etc. (Choose Danish or English)
Pressure, temperature and the nature of the medium are the most important factors when deciding which type of rubber O-ring to manufacture?
The most common types of rubber for O-rings are:
NBR
HNBR
Hydrogenated Nitrile Butadiene
HNBR is an improved version of NBR, as the material is more ozone-, weather- and heat-resistant. The elastomer has good sealing properties and good resistance to hydraulic oil, diesel oil, mineral oil and oil additives.
Temperature range: -40 °C to +150 °C,
short-term 180 °C *)
EPDM
Ethylene Propylene Rubber
EPDM rubber has good sealing properties, good weather resistance and good resistance to many organic liquids, acids and sludge. 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 fluorelastomer
This material is the ultimate in elastomers for use in conjunction with chemicals and high temperatures. FFPM can be explained as a material with chemical resistance similar to PTFE and setting properties similar to FPM. Due to the material’s chemical and temperature resistance,
FFPM is the elastomer that can best be used for longer periods in refineries, the pharmaceutical industry, the chemical industry, and in the semiconductor industry.
Trademarks: Perlast®, Kalrez®, Chemraz®
Temperature range: -15 °C to +330 °C *)
TFE/P
Tetrafluoroethylene propylene
TFE/P is a unique fluoroplastic that is particularly
Demonstrates good steam resistance. TFE/P also has good chemical resistance to oil-based acids and bases. Furthermore, the material is particularly suitable for electrical insulation.
Trademark: Aflas®
Temperature range: -10 °C to +230 °C,
short-term 250 °C *)
ETP
Ethylene / Tetrafluoroethylene / Perfluoromethylvenylether
ETP is a peroxidically vulcanized mixture of Ethylene, Tetrafluoroethylene (TFE) and Perfluoromethylether (PMVE). ETP is particularly suitable for use in the petrochemical industry, where today’s fuels are mixed with 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 substitute for TFE/P, as the material ETP is often cheaper and more chemically resistant.
Trademarks: Kemex™
Temperature range: -20 °C to +206 °C *)
Q
Silicone
This elastomer is suitable for both high and low temperatures and has low permanent deformation. However, since the material’s tensile strength, wear resistance, and tensile strength are poor, the material should only be used as a static seal. Silicone is resistant to sunlight, ozone, oxygen, UV light, and dry heat. Silicone does not tolerate most petroleum-based liquids or ketones, such as MEK and acetone, water vapor, and ethers. Silicone is not gas-tight. Silicone is tasteless, odorless, and completely non-toxic. Likewise, silicone is resistant to bacterial and fungal growth.
Temperature range: -60 °C to +200 °C *)
FVMQ
Fluorsilicones
This fluorinated silicone elastomer has most of the properties of silicone, but its oil and fuel resistance is significantly better. Furthermore, the material 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 breaking strength and poor tear and wear resistance.
Temperature range: -60 °C to +200 °C *)
CR
Chloroprene rubber
CR has good sentence-building abilities and good
Resistance to sunlight, ozone, oxygen and weather conditions. The material is therefore recommended for outdoor use. It also tolerates mineral oil and some types are resistant to freon. 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 haven’t found exactly what you were looking for, we are ready to help you find the right solution. The products on these pages are just a few examples from our almost limitless universe of possible product solutions.
