thoenes® gaskets

Our seals can be used in many areas:

Seals are indispensable in industrial plants. Flat gaskets are used for simple flange connections. For more demanding situations there are spiral ring or comb profile seals. Pumps and valves are sealed with mechanical seals or stuffing box packings. Boiler construction cannot do without handhole, headhole or manhole seals for the maintenance openings. These steam boiler openings are closed with corrugated ring seals or pressure-stable fabric seals, among other things. We can use loosely wrapped fiberglass braids for filtration and insulation.

We find almost all variants of sealing technology in power plants. In addition to flat gaskets for flanges and screw connections, we also find sealing and insulating cords, mechanical seals and stuffing box packings in a wide variety of designs. Selecting the right material and professional installation are critical to minimize downtime and ensure safety. That's why seals in power plants are essential elements that support the performance and reliability of these important systems.

In this area, sealing cords made of C-glass, E-glass or HT glass are usually used. For high-temperature industrial furnaces, there are also special materials such as silicon oxide or Belcotex, which can be used up to over 1000°C. We also produce our sealing cords in black for private fireplaces and pellet stoves. This is necessary because the steel doors and flaps are usually kept in dark gray and the sealing cords are partially visible through the integrated windows.

There is currently a lot of research and experimentation going on in this area. A frequently asked question is about hydrogen-resistant gasket material. The properties of hydrogen are comparable to helium. Most tests are therefore carried out with helium. However, our materials BA120 and BA130 are already marked with the H²-tested seal and can be used for hydrogen applications. The use of hydrogen as a replacement for natural gas is also causing debate. A proportion of 20% hydrogen in the natural gas for the seals is already no problem and can be implemented. According to the Viessmann company, gas heaters are already suitable for a hydrogen content of up to 20%. There are also conversion kits to make existing gas heaters fit for hydrogen.

Regardless of whether flange connections or screw connections, flat gaskets are used here. In the sanitary sector, most seals have uniform DIN sizes. These can then be manufactured in large quantities to be used in many different places. At Thoenes, almost any size and shape is cut or punched from flat gasket material according to customer requirements. In the event of an accident, we can also provide “first aid”. If necessary, we can even produce special seals in a very short time. After consultation, your fitter can then collect them from us promptly.

Mobility also places very special demands on seals. For example, in shipbuilding or aircraft construction, great attention is paid to the “fireproof” certification. The Belcotex textile fiber from which we make our sealing cords has this certificate. Furthermore, many different elastomers such as EPDM, NBR, silicone or FKM are used in mobility. The exact location is important. If the material comes into contact with petrol or oil, for example, it has to be the more expensive FKM. For a seal against splash water, for example for a taillight or turn signal, silicone or EPDM is sufficient.

Sometimes we receive inquiries that have nothing to do with a normal sealing application. Nevertheless, with our extensive range of materials and processing options, we can offer a solution in such situations.

  • Rubber can also be used as a damper, buffer or base. We supplied solid rubber as a support for bridge construction. 
  • Custom-made seals for classic car restoration that are no longer available for purchase. 
  • We also develop cords and packings according to our customers' specific wishes. Whether firmer or softer, combining a wide variety of materials or even braiding other products (garden hose, silicone core, etc.), we are looking for the ideal solution for you. 
  • Cords for vertical watering of plants that have good capillary action but do not rot 
  • Cords are wrapped with adhesive tape before cutting to prevent the fibers from splicing. We have developed a special impregnation so that it works without adhesive tape. 
  • We have developed a cut-resistant line. This can be used as a filler in expansion joints in sanitary areas. 
  • The joint is then sealed with silicone. When cutting out the old silicone joint, the cut protection cord does not damage the seal underneath.