Sealing Principle and Operational Process
Assembly Phase: The FKM O-ring is installed into a pre-machined rectangular or trapezoidal groove. Upon locking the components, the groove walls exert a predetermined amount of compression on the O-ring (static seal compression: 15%–30%; reciprocating dynamic seal compression: 10%–20%; rotary dynamic seal compression: 5%–12%).
Sealing Formation Phase: Under compression, the elastic FKM matrix undergoes elastic deformation, completely filling microscopic gaps between the groove and the mating metal or plastic parts to block media permeation paths. As media pressure rises, the O-ring is forced toward the low-pressure side of the groove, further increasing contact stress at the interface and creating a self-energizing sealing effect.
Continuous Operation Phase: Under conditions of fluctuating pressure and temperature, the FKM material maintains a stable elastic modulus and constant contact stress. Upon system shutdown and depressurization, the material recovers its original annular cross-section through its inherent elasticity; the absence of permanent plastic deformation ensures sealing reliability during reassembly.
Failure Limits: Sealing contact stress fails and media leakage occurs when the compression set exceeds 25%, the media swelling rate exceeds 15%, or surface cracking or hardening appears.
| Application | Recommended Compression |
|---|---|
| Static axial seal | 15%-30% |
| Static radial seal | 20%-35% |
| Dynamic seal |
10%-20% |
Media Compatibility
Suitable for long-term contact with: mineral hydraulic oils, engine oils, gear oils, diesel, gasoline, aviation kerosene, ethylene glycol antifreeze, ester-based lubricants, dilute acid/alkali solutions, and aromatic solvents.
Not suitable for long-term contact with: ketones, highly polar ester solvents, anhydrous amines, and high-concentration fuming nitric acid.
Swelling control during media immersion: Swelling rate ≤8% after 72 hours of immersion in standard fuel.
Applications
Automotive Industry: Sealing for fuel, engine oil, and cooling systems
Hydraulics Industry: Sealing for high-pressure cylinders, valve assemblies, and pump bodies
Petrochemical Industry: Oil-resistant, corrosion-resistant, and high-temperature sealing
New Energy: Battery thermal management and electric drive system sealing
Aerospace: High-pressure, high-temperature fuel and hydraulic sealing
Semiconductor/Pharmaceutical: FFKM for extreme corrosion and high-purity environments
WHY CHOOSE US?
Advanced Technology:
Equipped with state-of-the-art production facilities and a skilled R&D team.
Customization Capabilities:
Tailored solutions designed to fit your specific requirements.
Global Reach:
Dedicated to serving clients across the world with reliable products and exceptional service.
Proven Experience:
Decades of industry leadership and a commitment to continuous innovation.
FAQ:
1: What information is required for FKM O Ring quotation?
Please provide O Ring size (ID × CS), material requirement, hardness, operating temperature, pressure, sealing application and working medium.
2: What is the temperature range of FKM O Ring?
Standard FKM O Rings typically operate from -20℃ to 200℃. Special compounds can be developed for higher temperature or chemical resistance requirements.
3: Can you supply custom FKM O Rings?
Yes. We provide customized FKM O Rings with different sizes, hardness levels, compounds and performance requirements according to customer drawings or samples.
4: Which industries use FKM O Rings?
FKM O Rings are widely used in automotive engines, hydraulic equipment, oil & gas systems, chemical processing equipment, aerospace systems and new energy vehicles.
