These seals enhance safety by preventing leaks and withstanding thermal expansion and contraction. Depending on the material, operating temperature limits vary — For example, Silicone seals perform up to 232°C, FKM/Viton® up to 204°C, Fluorosilicone up to 200°C, while FFKM (Kalrez®) withstands temperatures as high as 327°C.
The chemical industry (CPI) relies on seals to resist aggressive substances and maintain performance at high temperatures. The automotive industry requires seals that handle engine heat and exposure to fuels. Other sectors, including semiconductors, medical devices, and pharmaceuticals, also use high temperature seals.
These seals are expected to tolerate heat but also must maintain mechanical performance. They may be used in vacuum conditions or repeatedly cycle between extreme temperatures up to 327°C (620°F). Choosing the right material and seal design is important for long-term reliability and efficiency.
Factors such as compatibility with surrounding chemicals, pressure conditions, and mechanical stress influence which seals are selected. Materials often used include silicone, fluorocarbon elastomers (FKM), perfluoroelastomers (FFKM), and fluorosilicone. These are selected because they resist thermal degradation, maintain elasticity, and provide chemical resistance.
High temperature rubber compounds
High temperature rubber compounds-maintains its properties under extreme conditions. Silicone rubber offers excellent flexibility and withstands temperatures up to 225°C. This makes it suitable for applications requiring both heat resistance and flexibility. Its durability and resistance to weathering make it ideal for outdoor and industrial uses where consistent performance is crucial.
Fluorocarbon elastomers (FKM), such as Viton™, provide superior chemical resistance and can operate at temperatures up to 200-250°C, depending on grade. But they may become less flexible at lower temperatures. Perfluoroelastomers (FFKM) offer even greater temperature resistance and chemical stability.
Fluorosilicone combines the benefits of Silicone and Fluorocarbon. It is flexible and chemically resistant, but doesn’t match the high temperature capabilities of FKM or FFKM. The selection of high temperature rubber depends on the specific requirements. Industries balance temperature range, chemical exposure, flexibility, and cost.
Long-term exposure to heat and chemicals can degrade some rubbers. Understanding the operating environment and maintenance needs is essential. Advances in compound formulations have improved performance. This has enabled seals and gaskets to last longer and perform more reliably.
High temperature gaskets and seals
High temperature gasket & seals are designed to prevent leaks and maintain pressure in elevated temperatures. They play a critical role in industries like chemical processing, semiconductor manufacturing, and the medical and pharmaceutical sectors. Equipment must operate under thermal stress, so Silicone, FKM, FFKM, and Fluorosilicone are often chosen.
Structurally, these gaskets must maintain flexibility. They need to accommodate thermal expansion and contraction and ensure a consistent seal. They also need to resist the compression set (the tendency of a material to deform permanently). High temperature gasket seals are found in engines, exhausts, and chemical reactors. They contribute to the safety and efficiency of these operations.
Selecting the appropriate gasket involves balancing several factors – the maximum operating temperature, the chemical environment, and mechanical pressures. Designers consider whether the gasket will face cyclic temperature changes or constant heat exposure. They also consider exposure to oils, fuels, or corrosive chemicals. The sealing’s compatibility with these conditions reduces downtime and maintenance costs. Proper installation techniques are also important to achieving an effective seal.
Techno Ad, as the distributor of DuPont’s Kalrez® in Israel, provides high-performance sealing solutions. Kalrez® perfluoroelastomer parts offer exceptional chemical resistance and can withstand high temperatures. This makes them suitable for industries requiring reliable sealing in extreme conditions.
High temperature gaskets are important for various systems that operate under thermal stress. The choice of materials and design considerations are important to ensure durability, safety, and efficiency.
