Oil and High-Temperature Resistant Sealing Ring Comprehensive Analysis

I. Definition and Core Characteristics

Oil and heat-resistant sealing rings are elastic sealing elements mainly made of fluoroelastomer (FKM) or perfluoroether rubber (FFKM), specifically designed for high-temperature (≤320℃) and oil-based mediums (such as fuel oil, lubricating oil, hydraulic oil) environments. They are widely used in the automotive, chemical, and energy equipment industries. Their core characteristics include:

Oil Resistance: Less than 5% swelling rate in mediums like fuel oil and gasoline; maintains seal integrity after long-term immersion.

High Temperature Resistance: Standard temperature range for fluoroelastomers is -20℃ to 250℃, while perfluoroether rubber (FFKM) can withstand short-term conditions up to 320℃.

Material

Fluororubber (FKM)

Fluorine content > 65%, fluorine atoms in the molecular chain form a strong adsorption effect, enhancing fuel resistance and anti-aging properties.

Operating Temperature: -20℃ to 250℃; Shore A hardness range: 70-90; suitable for dynamic sealing applications (e.g., engine crankshaft oil seals).

Perfluoroether rubber (FFKM)

All-perfluorinated backbone structure, resistant to over 1600 types of chemical media (including strong acids and strong oxidizers), with a maximum temperature resistance of up to 320°C.

Compressive deformation rate <10% (ASTM D395), suitable for long-term static high-pressure sealing.

Section 3: Structure Design & Application Scenarios

Structural Optimization:

Composite cross-section design: PTFE frame embedded in O-shaped ring to enhance extrusion resistance (suitable for environments with pressure exceeding 40MPa).

Coating Process: Surface coated with PTFE film, reducing friction coefficient (dynamic sealing resistance reduced by 25%), extending service life.

Typical Applications:

Automotive Industry: Fuel injection system seals, engine crankshaft seals, withstanding oil temperature fluctuations from 120℃ to 150℃.

Chemical Equipment: Reactor agitator shaft seal, oil pipeline flange seal, to prevent leakage of acidic oil media.

Energy Sector: Turbine lubrication system sealing, pressure-bearing up to 60 MPa.