China manufacturer of FFKM/FKM/VMQ/PTFE high temperature o-rings & heat resistant o-rings
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- Incoterm: EXW, FOB, CIF
- Shipping Way: By Air or Sea
- Manufacturer Place: Ningbo, China
- Delivery Time: 7 - 30 days
- Factory Status: Stocked for Sale
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Description
High Temperature O-Rings or Heat Resistant O-Rings are a kind of annular sealing element specially designed to maintain sealing performance in high-temperature environments. Their material and structure have been specially optimized, and they can maintain elasticity, sealing and long-term stable operation under high temperature conditions that ordinary rubber cannot withstand, preventing medium leakage or external pollution intrusion.
Their standard structure is a circular cross-section annular design, which fills the sealing gap through compression deformation and uses the contact pressure generated by elastic deformation to achieve efficient sealing of static or dynamic joint surfaces (such as flanges, valves, pistons, etc.). Compared with ordinary o-ring seals, their core advantage lies in high-temperature adaptability – depending on the different material properties (such as FKM, FFKM rubber, etc.), it can maintain elastic deformation ability and sealing performance for a long time in the temperature range of 150℃ to 300℃ or even higher, effectively cope with multiple challenges such as thermal expansion and chemical corrosion, and ensure zero leakage of medium and stable operation of equipment under high-temperature conditions.
High Temperature O-Ring Materials
O-rings are essential sealing components used in industries ranging from aerospace to automotive. However, in high-temperature environments, standard elastomers can degrade quickly, leading to leaks or failures. Selecting the right heat-resistant rubber is critical. Below, we often use common materials for high temperature o-rings and their unique properties.
| Material Type | Temperature Range | Characteristics | Typical Applications |
|---|---|---|---|
| FFKM High Temperature O-Rings | -25°C to +327°C | Extreme chemical resistance, high cost | Semiconductor manufacturing, Harsh chemical environments |
| FKM (Viton) High Temperature O-Rings | -20°C to +250°C | Oil & chemical resistant, may harden under prolonged high heat | Automotive engines, Chemical pipelines |
| Silicone (VMQ) High Temperature O-Rings | -60°C to +230°C | Good elasticity, ozone resistant, low mechanical strength & oil resistance | Ovens, HVAC equipment |
| PTFE (Teflon) High Temperature O-Rings | -200°C to +260°C | Excellent corrosion resistance, poor elasticity, requires composite reinforcement | Strong acid/alkali sealing, High-temperature valves |
Material Temperature Range Comparison
(-328°F) 0°C
(32°F) 200°C
(392°F) 400°C
(752°F)
1. Perfluoroelastomer (FFKM)
For the most demanding environments, FFKM (e.g., Tecnoflon®, Kalrez® or Chemraz®) offers unparalleled performance. It withstands temperatures up to 327°C (620°F) and resists nearly all chemicals, including aggressive acids and bases. FFKM O-rings are used in semiconductor manufacturing, oil and gas drilling, and pharmaceutical industries. The downside? FFKM is 10–20 times more expensive than FKM, making it a niche choice for critical applications where failure is not an option.
2. Fluoroelastomer (FKM/Viton)
Fluoroelastomers, commonly known by the brand name Viton®, are widely used for high-temperature O-rings due to their excellent chemical resistance and thermal stability. FKM can withstand continuous temperatures up to 200°C (392°F) and short-term exposure to 250°C (482°F). Its resistance to oils, fuels, and acids makes it ideal for automotive engines, chemical processing, and aerospace systems. However, FKM performs poorly in steam or polar solvents (e.g., ketones). For most industrial applications, FKM strikes a balance between cost and performance.
3. Silicone (VMQ)
Silicone O-rings excel in extreme temperature ranges, operating reliably from -60°C (-76°F) to 230°C (446°F). They maintain flexibility at low temperatures and resist hardening or cracking under heat. Silicone is also biocompatible, making it suitable for food processing and medical devices. However, its mechanical strength is lower than other elastomers, and it swells in hydrocarbon fuels. Silicone is often chosen for static seals in ovens, HVAC systems, or electrical insulation where chemical exposure is minimal.
4. PTFE (Teflon)
PTFE, best known by the brand name Teflon®, is not a traditional elastomer but a high-performance fluoroplastic widely used for extreme-temperature seals. It can operate continuously at 260°C (500°F) and withstand short-term spikes up to 300°C (572°F). PTFE O-rings boast near-universal chemical resistance, including to strong acids, bases, and solvents. They also exhibit low friction and excellent electrical insulation properties. However, PTFE lacks elasticity compared to rubber, making it better suited for static seals or applications with minimal movement. Its rigidity and cold-flow tendencies (deformation under pressure) may require reinforcement with fillers like glass or carbon. Common uses include chemical processing, cryogenics, and semiconductor equipment.
How to Choose High Temperature O-Rings?
Clear temperature range: including continuous working temperature and instantaneous peak temperature (such as short high temperature when the engine starts).
Media compatibility test: high temperature will accelerate chemical corrosion, and the compatibility of the material with the contact medium needs to be verified (such as ASTM D471 standard test).
Pressure and motion type:
- Static seal: low elastic materials such as PTFE can be selected.
- Dynamic seal: high elastic materials (such as FFKM) or composite structures (such as PTFE/FEP encapsulated o-rings) are required.
- Economic balance: FFKM has superior performance but high cost, and it is necessary to select materials reasonably according to working conditions.
Applications of High Temperature O-Rings
- Automobile turbocharger system (200-300℃)
- Industrial furnaces, high-temperature steam pipelines (150-250℃)
- Aerospace engine fuel seals (above 300℃)
- Chemical corrosion environment:
- Chemical reactor (acid/alkali + high temperature dual challenge)
- Semiconductor manufacturing (plasma resistance, high temperature etching gas)
- Hydraulic system high-temperature oil circuit
- Nuclear power equipment high-temperature and high-pressure valves
- Automobile: turbocharger system, exhaust seal (FFKM/FKM).
- Aerospace: engine fuel seal (FFKM/metal composite material).
- Chemical industry: reactor, high-temperature pump valve (PTFE coated o-ring).
- Energy: nuclear power steam pipeline, solar thermal collection system (silicone rubber/perfluoroether).