High Pressure Sealing Materials
Industrial seals require the highest performance under extreme conditions. Particularly in power plants, industrial plants, and mechanical engineering, there are often significant demands on mechanical and thermal load capacity during constantly recurring load changes.
High-performance materials and composite materials (so-called compounds) are used here. Examples include HPU solid, PTFE (Teflon) compounds with bronze or carbon, composite silicones, and NBR with fabric inserts.
Wear protection of seals
Seals often face stringent requirements regarding tightness and chemical resistance. When also subjected to high mechanical loads, it's essential to use wear-resistant materials or develop multi-component seals.
In such designs, the component resistant to wear absorbs mechanical forces, thereby protecting the other component. Polyurethane (PU) is especially wear-resistant, making it ideal for situations of increased friction or when minimal lubrication is possible. In these scenarios, PTFE or PU MOS2 are the preferred materials owing to their low friction properties.
Other sealing materials
Entirely different materials and unique forms are utilized in flat sealing technology. Aramid fibers (such as Frenzelit® Novapress or Klinger® Klinger-Sil) have proven to be reliable and are frequently used. In extreme temperature environments where standard plastics (like polyethylene) would degrade, materials such as graphite and mica are chosen. These substances are exceptionally well-suited for high-temperature applications.
Conversely, traditional materials like pressed cork, leather, and wool felt primarily hold historical significance in sealing applications. The initial radial shaft seals were crafted from leather in a metal frame. This design has since been supplanted by seals made of rubber or PTFE. These historical materials are mainly utilized for support and vibration damping.
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