Designing high-performance seals that are flexible and future-oriented

State-of-the-art manufacturing technology and “made in Germany” ensure sustainable production and short delivery times. (Image source: Karl Späh GmbH & Co. KG)

The requirements for modern sealing materials have risen steadily in recent years. Whereas the focus used to be primarily on basic sealing function and temperature resistance, today's criteria are significantly more complex. Materials are required that cover a broad and high-performance range of applications, can be flexibly adapted to different installation situations, have numerous national and international approvals, and at the same time comply with current and future regulatory requirements. Added to this are aspects such as PFAS-free, short delivery times, reliable availability, and production that is as regional and sustainable as possible in Europe.

This multitude of requirements poses challenges for manufacturers and users alike. At the same time, it opens new opportunities for innovative material concepts that further develop classic sealing solutions and adapt them to the needs of modern industries. Targeted portfolio expansions and the use of modern manufacturing processes are resulting in sealing materials that are not only high-performance but also future proof. Short production lead times, reproducible quality, and the possibility of individual customization are playing an increasingly central role in this context.

Material concepts for maximum performance

A proven approach to meeting these requirements is to combine high-quality fiber materials with elastomeric binders. In this case, aramid fibers are used, which are embedded in a stable matrix of nitrile rubber (NBR). This material architecture combines the high strength and temperature resistance of the fibers with the elasticity and chemical resistance of the rubber.

The result is a sealing material with very balanced properties in the areas of thermodynamics, mechanics, and chemistry. High thermomechanical resilience, excellent pressure resistance, and low thickness swelling contribute to the seal remaining dimensionally stable and reliable even under demanding operating conditions. At the same time, good compressibility and springback values ensure a secure seal even with changing loads or temperature fluctuations.

The maximum operating temperature of up to 350 °C and mechanical load limits of up to 100 bar open an exceptionally wide range of applications. This makes the material suitable not only for classic standard applications, but also for demanding applications where several types of stress occur simultaneously.

Versatile applications and hygienic advantages

Due to its properties, the material is used in numerous industries. It is particularly relevant for the food industry, municipal and industrial water supply, and areas of energy and gas technology. It can also demonstrate its advantages in the automotive industry, mechanical and plant engineering, and the chemical process industry.

The sealing material is based on high-quality aramid fibers. (Image source: Karl Späh GmbH & Co. KG)

An additional advantage is the bright, white color of the material. It facilitates visual inspections, supports hygiene concepts, and makes the material particularly attractive for sensitive applications where cleanliness, traceability, and product safety play a central role. In combination with the smooth surface structure, the risk of deposits or contamination is minimized.

Several material thicknesses are available as standard, covering a wide range of typical applications. In addition, other thicknesses or special formats can be produced to optimally accommodate specific installation situations or design features. This flexibility contributes significantly to reducing installation costs and increasing operational safety.

PFAS-free and regulatory future-proof

One aspect that is particularly relevant for the future is the PFAS-free non-stick coating of the material. This offers several advantages: On the one hand, it facilitates the processing and installation of the seals, as it reduces adhesion to flanges or components. On the other hand, it extends service life, as the seal can usually be removed without leaving any residue during disassembly.

In addition, the PFAS-free nature of the material contributes significantly to regulatory safety. In view of the intense discussions and foreseeable legal restrictions on materials containing PFAS, the material already meets requirements that will become mandatory in the future. This offers users investment security and reduces the risk of subsequent conversions or material changes.

Comprehensively tested, widely approved

A wide range of applications in regulated markets is only possible with the appropriate tests, certifications, and approvals. The material meets current German drinking water requirements and is also already approved for both cold and hot water in accordance with the KTWBWGL, which will be the only applicable standard in the future. Additional tests in accordance with DN 16421 (W270) confirm its suitability for contact with drinking water, even under hygienically demanding conditions.

One characteristic is the white color of the material. (Image source: Karl Späh GmbH & Co. KG)

With a view to the planned harmonization of the EU Drinking Water Directive in the coming years, the material already meets key future requirements today. This facilitates international use and helps companies to design their products to be compliant and competitive in the long term.

There is also a wide range of approvals for applications in the food industry. In addition to European Regulation EC 1935/2004, the material complies with several FDA regulations, including FDA 21CFR177.2600, FDA 21CFR180.22, and FDA 21CFR181.32. This portfolio is supplemented by important approvals for use in gas and fire protection applications, for example in accordance with DVGW, DIN, and SVGW standards.

Economic efficiency, sustainability, and process reliability

In addition to technical properties, economic and ecological aspects are also playing an increasingly important role. A durable seal with a long service life reduces maintenance intervals, minimizes downtime, and lowers operating costs in the long term. At the same time, regional, European manufacturing contributes to the stability of supply chains and reduces dependence on global markets.

The combination of reproducible quality, short delivery times, and technical advice enables users to plan projects efficiently and respond flexibly to changes. In safety-related applications, this increases process reliability and creates confidence in the materials used.

Conclusion

The high-performance sealing material described above ideally meets the diverse requirements of modern industrial applications. It is equally suitable for drinking water and food applications as well as for demanding technical applications with high thermal, mechanical, and chemical loads. Its balanced material composition, PFAS-free design, and comprehensive certifications make it a future-proof solution.

In combination with sustainable European production, a wide range of variants, and reliable availability, the result is a sealing concept that offers users long-term security, flexibility, and cost-effectiveness. Such materials thus form the basis for modern high-performance seals that meet the increasing demands of a wide variety of industries, both today and in the future.