O-ring FPM 69.45x3.53 mm FKM Viton - Fluoroelastomer Sealing Ring

Technical Specification

The nominal outside diameter is calculated geometrically:

This is a calculated nominal dimension, not an independently verified catalogue specification with a defined tolerance.

The Shore A hardness, exact FKM compound, operating temperature range, colour, manufacturer, and catalogue number have not been established.

Important information about Viton: Viton is a registered trademark associated with specific fluoroelastomer materials. Without manufacturer documentation, it cannot be assumed that every FKM O-ring is manufactured from genuine Viton-branded material.

What Does O-ring FPM 69.45x3.53 mm FKM Viton Mean?

FPM and FKM are designations used for the same broad family of fluorocarbon elastomers, although they originate from different material nomenclature systems.

The FKM designation alone does not specify the monomer composition, compound formulation, hardness, or complete chemical resistance characteristics.

FPM / FKM Material Properties

FKM fluoroelastomers are widely used in industrial sealing technology because of their resistance to elevated temperatures, many oils, and selected chemicals.

Typical characteristics include:

• Good resistance to many mineral and synthetic oils.

• Resistance to numerous fuels and hydrocarbons, depending on compound formulation.

• Suitability for selected elevated-temperature applications.

• Good resistance to ozone, ultraviolet radiation, and atmospheric ageing.

• Relatively low permeability to many gases compared with certain other elastomer families.

• Limited compatibility with some ketones, amines, esters, and other chemicals.

Chemical resistance depends on the FKM type, compound formulation, medium concentration, temperature, and exposure duration.

A universal temperature rating or chemical resistance profile must not be assigned to this specific O-ring without verified compound documentation.

Construction and Operating Principle

O-ring FPM 69.45x3.53 mm FKM Viton is a closed elastomer ring with a nominal circular cross-section diameter of 3.53 mm.

When installed in a correctly designed sealing groove, the O-ring undergoes controlled compression. This generates contact pressure against the mating surfaces and helps prevent fluid or gas leakage.

Sealing performance depends on:

• Groove geometry and dimensional tolerances.

• O-ring compression.

• FKM compound hardness.

• Operating pressure and temperature.

• Chemical compatibility with the sealed medium.

• Surface finish of mating components.

• Compression set characteristics.

• Installation conditions and relative movement.

Dynamic applications additionally require assessment of friction, lubrication, movement speed, and possible seal wear.

Comparison of FKM, NBR and VMQ O-rings

This table describes general elastomer family characteristics. It does not establish the verified performance of any specific compound or justify automatic material substitution.

Selection and Interchangeability

Before selecting O-ring FPM 69.45x3.53 mm FKM Viton, verify:

1. Nominal inside diameter of 69.45 mm.

2. Nominal cross-section diameter of 3.53 mm.

3. Dimensional tolerances.

4. Shore A hardness.

5. Exact FKM compound type and formulation.

6. Chemical compatibility with the sealed medium.

7. Operating pressure and temperature.

8. Groove geometry and required compression.

9. Static or dynamic sealing conditions.

10. Material documentation and manufacturer traceability requirements.

An FKM O-ring measuring 69.45x3.53 mm is not automatically interchangeable with an NBR, EPDM, or VMQ O-ring of identical dimensions.

Even two FKM O-rings may have different performance characteristics if they are manufactured from different compounds.

Applications

O-ring FPM 69.45x3.53 mm FKM Viton may be considered for appropriately designed industrial systems requiring the general properties of fluoroelastomers.

Potential applications include:

• Static seals in housings, covers, and flanged connections.

• Selected hydraulic systems using compatible fluids.

• Oil and lubrication systems.

• Selected fuel-handling systems.

• Industrial equipment operating at elevated temperatures.

• Valves and technical fluid-control equipment.

• Appropriately engineered dynamic sealing arrangements.

These applications reflect general FKM material characteristics. They do not confirm suitability for a specific machine, OEM assembly, fluid, or operating condition.

Alternative Designations and Reference Numbers

Common descriptive variations include:

• O-ring FPM 69.45x3.53 mm FKM Viton

• O-ring FKM 69.45x3.53 mm

• O-ring FPM 69.45x3.53 mm

• Fluoroelastomer O-ring 69.45x3.53 mm

• FKM Sealing Ring 69.45x3.53 mm

• Fluorocarbon Rubber O-ring 69.45x3.53 mm

These are descriptive naming alternatives, not verified manufacturer catalogue numbers.

No confirmed OEM reference or manufacturer-specific interchangeable part number has been established.

Installation and Storage

Before installation, verify the O-ring dimensions against the sealing groove and inspect the mating surfaces.

During installation:

• Clean the groove and remove contamination.

• Eliminate sharp edges that could damage the elastomer.

• Avoid excessive stretching.

• Prevent twisting of the O-ring.

• Use installation lubricants compatible with the specific FKM compound.

• Position the ring evenly inside the groove.

• Ensure the seal is not pinched during assembly.

FKM O-rings should be stored in clean, dry conditions without excessive deformation and protected from heat sources and chemical contamination.

FAQ - Frequently Asked Questions

What are the dimensions of O-ring FPM 69.45x3.53 mm FKM Viton?

The nominal inside diameter is 69.45 mm, and the cross-section diameter is 3.53 mm. The calculated nominal outside diameter is 76.51 mm.

Do FPM and FKM refer to the same material?

Both designations are used for the fluoroelastomer family. However, they do not identify a specific compound formulation or guarantee identical properties across all products.

Is every FKM O-ring manufactured from genuine Viton?

No. Viton is a trademark for specific fluoroelastomer materials. Genuine Viton-branded material requires appropriate manufacturer documentation or traceability.

Is O-ring FKM 69.45x3.53 mm oil-resistant?

FKM fluoroelastomers generally provide good resistance to many mineral and synthetic oils. Compatibility with a specific oil must be verified for the actual compound and operating conditions.

What is the Shore A hardness of O-ring FPM 69.45x3.53 mm?

The hardness has not been specified. Neither the dimensions nor the FPM/FKM designation establishes a particular Shore A value.

Can an FKM O-ring operate at high temperatures?

FKM elastomers are commonly used in elevated-temperature sealing applications. However, the permissible temperature depends on the specific compound, sealed medium, and exposure duration. No exact operating temperature has been confirmed for this product.

Can an FKM O-ring replace an NBR O-ring of the same dimensions?

Not automatically. FKM and NBR differ in chemical resistance, temperature performance, and mechanical properties. Replacement requires verification of the complete operating conditions.

Is O-ring FPM 69.45x3.53 mm suitable for dynamic sealing?

It may be considered for appropriately engineered dynamic applications, provided hardness, friction, lubrication, movement speed, and other operating parameters are verified.

O-ring FPM 69.45x3.53 mm FKM Viton - Key Technical Information

O-ring FPM 69.45x3.53 mm FKM Viton is a fluoroelastomer sealing ring with a nominal inside diameter of 69.45 mm and a cross-section diameter of 3.53 mm. Its calculated nominal outside diameter is 76.51 mm. FKM materials are used in applications requiring resistance to many oils, fuels, and elevated temperatures. Correct selection requires verification of compound formulation, hardness, and operating conditions.

FPM/FKM O-rings at simmering.pl

simmering.pl is a specialist B2B industrial trading platform supplying FPM/FKM O-rings, technical seals, oil seals, bearings, and industrial components to manufacturers, maintenance departments, engineers, and industrial procurement professionals.

Based in Lublin, Poland, simmering.pl provides worldwide shipping from stock in Poland, subject to product availability and destination-specific shipping arrangements.