Rubber & steel seals

Rubber and rubber-steel seals combine the flexibility of elastomer with the stability of a steel core. This creates an optimal balance between deformability, pressure resistance, and long-term sealing performance. These seals are particularly suitable for drinking water, gas, and industrial applications up to 40 bar, where reliability and standardization are crucial.

NBR

Rubber seals suitable for drinking water, gas, and industrial applications

Rubber seals offer a flexible and reliable sealing solution for diverse applications in water treatment, gas distribution, chemical processes, and general industry. Thanks to the wide choice of elastomers, rubber seals can be precisely matched to the medium, temperature, pressure, and certification requirements. From simple static seals to technically optimized rubber-metal reinforced versions: KLINGER offers a suitable solution for every application.

Where additional mechanical stability or controlled compression is required, rubber-metal reinforced seals such as KLINGER KGS GII offer clear added value.

Solid rubber seals

Solid rubber seals are used when flexibility, easy installation, and high adaptability to flange surfaces are central. Thanks to their elastic nature, they compensate well for slight flange irregularities and ensure a reliable seal at relatively low bolt loads.

Typical applications:

Drinking water installations
Gas and methane applications
Process water
Wastewater
HVAC
Air and ventilation systems
Light chemical applications
Food industry

Rubber seals are available as sheet material, die-cut seals, profiles, and fully customized solutions.

Available elastomers

The correct elastomer is selected depending on the medium and operating conditions:

EPDM: Excellent resistance to water, hot water, ozone, UV, and aging.
NBR: Good resistance to oils, fats, fuels, and gas.
FKM: Excellent chemical resistance and high temperature resistance.
CR (Neoprene): Good mechanical properties and decent weather resistance.
CSM (Hypalon-type): Highly resistant to UV, ozone, and various chemicals.
VMQ (Silicone): Excellent flexibility at high and low temperatures.
IIR (Butyl): Very low gas permeability and good chemical resistance.

In addition, compounds are also available in SBR, cellular rubber, and other specialized elastomers.

Rubber-metal reinforced seals

When flexibility must be combined with structural stability, rubber-metal reinforced seals offer significant added value. By combining an elastomer layer with an integrated steel reinforcement, a seal is created that:

Is more dimensionally stable
Compresses in a more controlled manner
Is more resistant to mechanical stress
Has less risk of extrusion
Delivers more consistent sealing performance in the long term

These versions are particularly suitable for connections where reliability, dimensional stability, and low bolt load converge.

KLINGER KGS GII – premium engineered solution

Within this segment, KLINGER KGS GII represents a high-quality rubber-metal reinforced solution. The integrated steel core ensures controlled compression and increased mechanical stability, while the elastomer adapts optimally to the flange surface.

Advantages of KLINGER KGS GII:

Reliable sealing at low bolt force
High dimensional stability
Limited risk of over-compression
Lower risk of elastomer extrusion
Long service life
Easy installation
Ideal for plastic flanges, PE, and HDPE systems
Suitable for drinking water, gas, and industrial applications

When to choose a rubber seal?

A flexible rubber seal is particularly suitable when:

Flexibility is required
Slight flange irregularities must be compensated for
Fast installation is important
Drinking water or gas applications are involved
Not every rubber seal is equal. Medium, temperature, pressure, standards, and flange construction together determine the right choice.
Our engineers are happy to assist you in selecting the right solid rubber or rubber-metal reinforced seal, fully tailored to your application.

Are you unsure between different rubber seals? Our engineers will review your application and advise on the right solution. Contact us for an appointment.

Frequently asked questions about rubber-steel seals or rubber sealing tapes

1. What is the difference between a rubber and a rubber-steel seal?

A solid rubber seal consists entirely of elastomer and offers maximum flexibility. This makes it particularly suitable for compensating for slight flange irregularities and providing a reliable seal at relatively low bolt loads.

A rubber-metal reinforced seal combines elastomer with an integrated steel core. This metal reinforcement provides extra mechanical stability, more controlled compression, and a more consistent bolt load distribution. This makes these seals particularly suitable for applications where dimensional stability and structural support are important.

2. For which applications are rubber seals suitable?

Rubber seals are widely used in:

Drinking water installations
Gas and methane applications
Process water
Wastewater treatment
HVAC installations
Air and ventilation systems
Light chemical applications
Food industry

The final suitability always depends on the chosen elastomer, the medium, temperature, pressure, and flange construction.

3. For what pressure are rubber seals suitable?

The maximum operating pressure of a rubber seal depends on several factors, including:

Chosen elastomer
Material hardness
Seal thickness
Any metal reinforcement
Bolt load
Type of flange connection

Rubber seals are often used in low to medium pressure applications, but higher pressures are also possible on a project basis when material choice and construction are correctly aligned.

4. When should I choose a rubber-steel seal instead of solid rubber?

A rubber-metal reinforced seal is often the best choice when:

Low bolt load is available
Extra mechanical stability is required
Large diameters must be sealed
Plastic flanges are used
Dimensional stability is important
The risk of extrusion must be limited

In these applications, KLINGER KGS GII offers a particularly reliable solution thanks to the combination of elastic sealing and structural support.

5. Can rubber seals be supplied custom-made?

Yes. In addition to standard dimensions, rubber seals can also be produced custom-made for specific projects, including specific hardnesses or modified versions.

Possibilities include:

Specific dimensions
Custom thicknesses
Different hardnesses (Shore)
Compound selection based on medium
Certifications for drinking water, gas, or food
Rubber-metal reinforced versions

This ensures you always receive a seal that technically matches your installation.

Need advice on rubber or rubber-steel seals?

Are you unsure about the right seal for your application? Our specialists are happy to help you choose the right material and the right version.