O-Ring FPM 40x4 mm FKM Viton Rubber Seal

What Is the O-Ring FPM 40x4 mm FKM Viton?

The O-Ring FPM 40x4 mm is a high-performance sealing ring manufactured from FPM (FKM, Viton®) fluoroelastomer. Designed for demanding industrial applications, it provides excellent sealing performance in systems exposed to high temperatures, mineral oils, synthetic oils, fuels, hydraulic fluids and aggressive chemicals. The 40x4 mm size refers to an inside diameter of 40 mm and a cross-section of 4 mm.

Applications

The FPM 40x4 mm O-Ring is commonly used in:

• Hydraulic systems
• Pneumatic systems
• Pumps
• Valves
• Hydraulic cylinders
• Compressors
• Internal combustion engines
• Gearboxes
• Industrial machinery
• Chemical processing equipment
• Automotive applications
• OEM equipment

Technical Specification

Product Type: O-Ring

Material: FPM / FKM (Viton®)

Inside Diameter: 40 mm

Cross Section: 4 mm

Colour: Brown

Hardness: 75 Shore A (unless otherwise specified)

Operating Temperature: Approximately -20°C to +200°C

Resistance to:

• Mineral oils
• Synthetic oils
• Lubricating greases
• Gasoline
• Diesel fuel
• Hydraulic fluids
• Ozone
• UV radiation
• Weathering
• Many industrial chemicals

Why Choose FPM (FKM Viton®)?

FPM (FKM) is selected for applications where standard NBR rubber cannot provide sufficient resistance to temperature or aggressive media.

Key advantages include:

• Excellent high-temperature resistance
• Outstanding chemical resistance
• Excellent resistance to fuels and oils
• Low compression set
• Excellent ageing resistance
• Ozone and UV resistance
• Long service life
• Dimensional stability

Typical Industrial Applications

The 40x4 mm FPM O-Ring is suitable for:

• Chemical industry
• Petrochemical industry
• Hydraulic equipment
• Pneumatic systems
• Automotive engineering
• Power generation
• Industrial machinery
• Process equipment
• Fluid handling systems
• OEM manufacturing

Installation Recommendations

Before installation, verify:

• Groove dimensions
• Sealing surface condition
• Chemical compatibility
• Operating temperature
• Working pressure
• Appropriate assembly lubrication

Proper installation helps ensure reliable sealing performance and extended service life.

Frequently Asked Questions (FAQ)

What is the difference between FPM and NBR?

FPM (FKM, Viton®) offers significantly higher resistance to heat, fuels, oils and aggressive chemicals than standard NBR rubber.

Is the FPM O-Ring suitable for gasoline?

Yes. FPM provides excellent resistance to gasoline, diesel fuel and many petroleum-based fluids.

Can it be used in hydraulic systems?

Yes. It is widely used in hydraulic systems operating at elevated temperatures and with compatible hydraulic fluids.

What is the operating temperature range?

Typically -20°C to +200°C, depending on the specific compound and operating conditions.

Are FKM and Viton® the same?

FKM is the international material designation for fluoroelastomer according to ASTM standards, while Viton® is a registered trademark for a family of FKM materials.