O-ring FPM 150x2.5 FKM Viton - Fluoroelastomer Sealing Ring

Technical Specifications

The nominal outside diameter is calculated as follows:

150 mm + 2 x 2.5 mm = 155 mm.

The value of 155 mm is a geometrically calculated nominal dimension. It does not represent a separately verified manufacturing inspection dimension.

Shore A hardness, exact FKM compound, manufacturing tolerances, and permissible operating temperature range are not specified in the supplied product designation.

What Does O-ring FPM 150x2.5 FKM Viton Mean?

FPM and FKM refer to the same general family of fluoroelastomers. However, the properties of individual compounds may differ depending on their chemical composition and curing system.

Viton is a trademark, not a universal designation for all FKM elastomers. The presence of this name in the product designation does not independently confirm that the sealing ring is manufactured from a genuine Viton-branded compound.

Construction and Operating Principle

O-ring FPM 150x2.5 FKM Viton is a continuous elastomeric sealing ring with a circular cross-section of 2.5 mm.

When installed in a correctly designed sealing groove, the ring undergoes controlled compression. Elastomer deformation generates contact pressure between the O-ring and the mating surfaces.

This contact pressure restricts the passage of the working medium through the sealing interface.

Sealing performance depends on:

• Sealing groove geometry and dimensional tolerances.

• Compression of the 2.5 mm cross-section.

• Stretching of the ring during installation.

• Surface roughness of mating components.

• Operating pressure and extrusion gap.

• Operating temperature.

• Chemical compatibility between the FKM compound and the working medium.

• Compression set of the elastomer during service.

With an inside diameter of 150 mm, uniform positioning around the entire circumference is important. Twisting of the cross-section and localised stretching should be avoided during installation.

FPM / FKM - Fluoroelastomer Material Properties

FKM belongs to the family of fluorocarbon elastomers used in industrial sealing technology.

Appropriately selected FKM compounds may provide:

• Resistance to many mineral and synthetic oils.

• Resistance to selected fuels and hydrocarbons.

• Good resistance to ozone and atmospheric ageing.

• Suitability for elevated operating temperatures.

• Effective sealing performance in correctly designed assemblies.

However, chemical resistance is not identical for all FKM compounds.

Standard fluoroelastomers may be unsuitable for contact with ketones, certain amines, hot water, steam, and selected glycol-based fluids. Specialised compounds may offer different resistance characteristics.

Exact chemical compatibility must be verified for the specific working medium, temperature, and exposure duration.

O-ring FPM 150x2.5 FKM Viton vs Other Variants

The difference between 2 mm and 2.5 mm cross-sections directly affects sealing groove geometry and compression.

An O-ring 150x2 mm is not automatically interchangeable with an O-ring 150x2.5 mm.

Likewise, identical nominal dimensions do not guarantee interchangeability between FKM, NBR, and EPDM sealing rings.

O-ring Selection and Interchangeability

Before selecting O-ring FPM 150x2.5 FKM Viton, verify the requirements of the sealing application.

Important selection criteria include:

• Inside diameter: 150 mm.

• Cross-section diameter: 2.5 mm.

• Material: FPM / FKM.

• Exact fluoroelastomer compound.

• Shore A hardness.

• Dimensional tolerances.

• Sealing groove depth and width.

• Required cross-section compression.

• Permissible stretching during installation.

• Operating pressure and extrusion gap.

• Operating temperature.

• Chemical compatibility with the working medium.

• Static or dynamic sealing conditions.

When selecting a replacement, compare not only the nominal dimensions but also the material requirements specified in the equipment documentation.

Applications of O-ring FPM 150x2.5 FKM Viton

O-ring FPM 150x2.5 FKM Viton may be considered for appropriately designed sealing arrangements in:

• Industrial equipment housings and covers.

• Flanged mechanical connections.

• Oil systems operating with compatible fluids.

• Selected fuel system applications.

• Mechanical assemblies requiring a 2.5 mm sealing cross-section.

These are typical potential application categories for FKM sealing rings, not confirmed applications of this specific product in a particular machine.

Dynamic sealing applications require separate evaluation of friction, lubrication, operating speed, and sealing groove design.

Alternative Designations and Reference Formats

Natural descriptive formats include:

• O-ring FPM 150x2.5 FKM Viton

• O-ring 150x2.5 FKM

• O-ring 150x2.5 FPM

• FKM O-ring 150x2.5

• FPM Sealing Ring 150x2.5

• Fluoroelastomer O-ring 150x2.5

These are descriptive reference formats, not confirmed OEM numbers or manufacturer catalogue references.

The primary product designation remains O-ring FPM 150x2.5 FKM Viton.

Installation, Handling and Storage

Before installation, clean the sealing groove and mating surfaces and inspect the condition of the sealing ring.

During installation:

• Protect the O-ring from sharp edges.

• Avoid excessive stretching.

• Prevent twisting of the ring.

• Ensure uniform positioning inside the groove.

• Use only assembly lubricants compatible with the FKM compound and working medium.

• Verify correct seating before closing the assembly.

Store sealing rings in clean conditions, protected from mechanical damage, excessive heat, and chemicals that may affect the elastomer.

Frequently Asked Questions - FAQ

What are the dimensions of O-ring FPM 150x2.5 FKM Viton?

The inside diameter is 150 mm, and the cross-section diameter is 2.5 mm. The geometrically calculated nominal outside diameter is 155 mm.

Are FPM and FKM the same material?

Yes. FPM and FKM are designations referring to the same general family of fluorocarbon elastomers. Exact properties depend on the specific compound.

Is every FKM O-ring manufactured from genuine Viton?

No. Viton is a trademark associated with specific fluoroelastomers. Not every FKM sealing ring is manufactured from a genuine Viton-branded compound.

Is O-ring FPM 150x2.5 resistant to oils and fuels?

Many FKM compounds offer resistance to oils and selected fuels. Compatibility must be confirmed for the specific working medium and operating conditions.

Can O-ring 150x2.5 be replaced with O-ring 150x2?

Not without verifying the sealing groove design. The 0.5 mm difference in cross-section affects compression and sealing performance.

What is the hardness of O-ring FPM 150x2.5 FKM Viton?

The hardness is not specified in the product designation. It requires confirmation against the technical product documentation.

Is O-ring FKM 150x2.5 suitable for high temperatures?

Many FKM compounds are designed for elevated operating temperatures. The exact permissible range for this particular product has not been confirmed.

Is the outside diameter 155 mm?

Yes. This is the nominal outside diameter calculated from the 150 mm inside diameter and 2.5 mm cross-section. Actual manufactured dimensions depend on production tolerances.

O-ring FPM 150x2.5 FKM Viton - Key Technical Information

O-ring FPM 150x2.5 FKM Viton is a fluoroelastomer sealing ring with a 150 mm inside diameter and a 2.5 mm cross-section. Its calculated nominal outside diameter is 155 mm. FPM/FKM materials can provide resistance to selected oils, fuels, and elevated temperatures. Correct selection requires verification of the compound, hardness, and sealing groove geometry.

FPM / FKM O-rings at simmering.pl

FPM / FKM O-rings, industrial sealing components, rolling bearings, and mechanical accessories are available through simmering.pl, a specialist B2B trading platform serving industrial companies, engineers, maintenance departments, and technical purchasing teams.

Our warehouse and order processing facilities are located in Lublin, Poland. We provide worldwide shipping from stock in Poland.

Technical product identification and selection assistance is available based on sealing dimensions, elastomer material, hardness, and application requirements.