O-Ring FPM 9x1.75 mm FKM - Fluoroelastomer Viton Type Seal

O-Ring FPM 9x1.75 mm FKM - Fluoroelastomer Viton Type Seal

O-Ring FPM 9x1.75 mm is a fluoroelastomer sealing ring with a 9 mm inside diameter and 1.75 mm cross-section. Its nominal outside diameter is approximately 12.5 mm. FPM/FKM O-rings are widely used for demanding industrial sealing applications involving compatible oils, fuels, lubricants, hydrocarbons, elevated temperatures and many chemicals. Viton is a widely searched term for FKM seals, but it is a trademark for specific fluoroelastomer materials rather than a generic name for every FKM compound.

O-Ring FPM 9x1.75 mm - Technical Data

Key product parameters:

• Product type: O-ring / sealing ring
• Material: FPM / FKM
• Material family: fluoroelastomer
• Inside diameter ID: 9 mm
• Cross-section CS: 1.75 mm
• Outside diameter OD: approximately 12.5 mm
• Common search term: Viton O-Ring 9x1.75 mm
• Application: industrial and technical sealing

The dimension:

9x1.75 mm

means an inside diameter of 9 mm and a cross-section diameter of 1.75 mm.

O-Ring 9x1.75 mm Dimensions

The nominal outside diameter can be calculated using:

OD = ID + 2 x CS

For a 9x1.75 mm O-ring:

OD = 9 mm + 2 x 1.75 mm = 12.5 mm

The nominal outside diameter is therefore approximately 12.5 mm.

What is FPM?

FPM is a designation used for fluorocarbon elastomers, also known as fluoroelastomers.

These materials are widely used for sealing applications where conventional elastomers may not provide sufficient resistance to the operating environment.

Depending on the exact compound, FPM/FKM O-rings can provide resistance to many:

• mineral oils
• engine oils
• transmission oils
• lubricating greases
• fuels
• hydrocarbons
• chemicals
• elevated operating temperatures

Exact chemical and temperature resistance depends on the specific FKM compound, operating medium, concentration, pressure, temperature and exposure time.

FPM vs FKM - What Is the Difference?

FPM and FKM are designations associated with the same broad family of fluoroelastomer sealing materials, although they originate from different nomenclature systems.

For this reason, technical catalogues and product searches may use both:

FPM O-Ring 9x1.75 mm

and:

FKM O-Ring 9x1.75 mm

The two designations do not mean that every FKM compound has identical properties.

Different FKM formulations can vary significantly in chemical resistance, low-temperature performance, high-temperature capability and compatibility with particular media.

FKM vs Viton - Are They the Same?

Not exactly.

FKM is a generic designation for a class of fluoroelastomers.

Viton is a trademark used for specific fluoroelastomer materials.

Therefore, the term Viton O-Ring 9x1.75 mm is frequently used as a search and commercial term for FKM O-rings, but not every FKM O-ring should automatically be described as being manufactured from genuine Viton material.

Unless the exact branded compound is documented, FPM/FKM is the technically safer material designation.

FKM O-Ring 9x1.75 for High Temperature Applications

One of the principal reasons for selecting FKM is its suitability for more demanding temperature conditions than many standard elastomers.

FKM O-rings are therefore widely used in:

• engines
• gearboxes
• industrial machinery
• oil systems
• process equipment
• mechanical systems operating at elevated temperatures

However, there is no single universal maximum operating temperature applicable to every FKM O-ring.

The permitted temperature range depends on the exact compound, operating medium and application conditions.

FKM O-Ring 9x1.75 for Oil

FKM is widely used for sealing applications involving many oils and lubricants.

When correctly selected, an FKM 9x1.75 mm O-ring may be suitable for compatible:

• mineral oils
• engine oils
• transmission oils
• lubricating oils
• greases

Compatibility should always be confirmed for the specific oil, operating temperature and FKM compound.

FKM O-Ring 9x1.75 for Fuel

FKM fluoroelastomers are commonly selected for many fuel and hydrocarbon sealing applications.

This makes FKM important in:

• automotive systems
• fuel systems
• engines
• industrial equipment
• pumps
• valves

However, compatibility should be checked for the exact fuel formulation.

Petrol, diesel fuel, biofuel blends and fuels containing different additives can interact differently with elastomer compounds.

Chemical Resistance of FKM O-Rings

FKM is known for its broad chemical resistance, but the term chemical resistant O-ring should not be interpreted as resistance to every chemical.

Correct material selection should consider:

• exact medium
• concentration
• operating temperature
• pressure
• exposure time
• FKM compound
• static or dynamic operation

For aggressive chemicals, compatibility should be checked against technical data for the specific compound.

O-Ring FKM vs NBR

NBR and FKM are both widely used sealing materials, but they are not automatically interchangeable.

NBR is commonly selected for standard industrial, hydraulic and oil sealing applications.

FKM is often selected when the application involves more demanding conditions related to:

• temperature
• fuels
• hydrocarbons
• oils
• chemical exposure

The correct choice depends on actual operating conditions rather than dimensions alone.

A 9x1.75 mm NBR O-ring should therefore not automatically replace a 9x1.75 mm FKM O-ring.

O-Ring FKM vs EPDM

FKM and EPDM have very different chemical resistance profiles.

EPDM is commonly selected for applications involving water, hot water and many water-based media.

FKM is generally more appropriate for many oils, fuels and hydrocarbons.

For this reason, an EPDM 9x1.75 mm O-ring should not automatically be treated as a substitute for an FKM 9x1.75 mm O-ring.

O-Ring FKM vs VMQ Silicone

VMQ silicone and FKM are different elastomer families.

VMQ is valued for its flexibility across a broad temperature range, while FKM provides a different combination of chemical, oil, fuel and temperature resistance.

Identical dimensions do not make FKM and VMQ O-rings interchangeable.

Typical Applications of FPM/FKM 9x1.75 mm O-Rings

Depending on the exact operating conditions, an FPM/FKM 9x1.75 mm O-ring can be used in:

• industrial machinery
• automotive systems
• hydraulic equipment
• pneumatic equipment
• pumps
• valves
• fittings
• gearboxes
• oil systems
• fuel systems
• mechanical equipment
• maintenance and repair applications

Suitability for a specific application depends on dimensions, compound, medium, temperature, pressure and sealing-system design.

Static and Dynamic Sealing

An FKM 9x1.75 mm O-ring may be used in correctly designed static seals and selected dynamic applications.

For static sealing, important factors include:

• groove dimensions
• O-ring compression
• groove fill
• pressure
• medium
• material compatibility

Dynamic applications additionally require consideration of:

• friction
• speed
• lubrication
• temperature
• surface finish
• wear

The 9x1.75 mm dimensions alone do not determine suitability for a dynamic sealing application.

How to Select an FPM 9x1.75 mm O-Ring

Check the following parameters before selecting an O-ring:

1. Inside diameter ID - 9 mm
2. Cross-section CS - 1.75 mm
3. FPM/FKM material
4. Compound hardness
5. Operating medium
6. Temperature
7. Pressure
8. Static or dynamic movement
9. Groove geometry
10. Application-specific requirements

The size 9x1.75 mm alone does not confirm full interchangeability.

Are All 9x1.75 mm O-Rings the Same?

No.

O-rings with identical 9x1.75 mm dimensions can be manufactured from different elastomers, including:

• NBR
• FKM/FPM
• EPDM
• VMQ
• FVMQ

They can also differ in hardness, compound formulation, tolerances and approvals.

Both dimensions and material specification should therefore be checked before replacement.

Does O-Ring Colour Identify FKM?

No.

Colour alone is not a reliable method for identifying an elastomer.

FKM O-rings can be manufactured in different colours, and similar colours may also be used for other elastomer materials.

Material identification should be based on the product specification.

Is an FKM O-Ring Food Grade?

Not automatically.

The designation FKM does not by itself confirm suitability for food-contact applications.

If food-contact compliance is required, documentation for the exact compound and finished product should be checked against the applicable requirements.

Technical Specification

Common O-Ring Selection Mistakes

Common mistakes include:

• confusing inside and outside diameter
• selecting an O-ring only by its dimensions
• overlooking the 1.75 mm cross-section
• assuming all FKM compounds are identical
• treating every FKM O-ring as genuine Viton
• ignoring chemical compatibility
• ignoring temperature
• ignoring pressure
• overlooking groove dimensions
• assuming NBR, EPDM, VMQ and FKM are interchangeable

Correct O-ring selection requires both dimensional and material compatibility.

FAQ - FPM FKM O-Ring 9x1.75 mm

What are the dimensions of the FPM 9x1.75 mm O-ring?

The O-ring has a 9 mm inside diameter and a 1.75 mm cross-section.

What is the outside diameter of a 9x1.75 mm O-ring?

The nominal outside diameter is approximately 12.5 mm.

What is FPM?

FPM is a designation for fluoroelastomer sealing materials.

Are FPM and FKM the same?

FPM and FKM are designations associated with the same broad fluoroelastomer family. Exact properties still depend on the specific compound.

Is FKM the same as Viton?

FKM is a generic fluoroelastomer classification, while Viton is a trademark for specific fluoroelastomer materials. Not every FKM O-ring is necessarily made from genuine Viton.

Is an FKM 9x1.75 mm O-ring suitable for oil?

FKM is widely used with many oils and lubricants. Compatibility should be confirmed for the specific medium, compound and operating temperature.

Is an FKM 9x1.75 mm O-ring suitable for fuel?

FKM is commonly used in many fuel sealing applications. Exact compatibility depends on the FKM compound and fuel formulation.

Is FKM suitable for high temperatures?

FKM is widely used for elevated-temperature sealing applications. The exact permissible temperature range depends on the compound, medium and operating conditions.

Can an NBR 9x1.75 O-ring replace an FKM 9x1.75 O-ring?

Not automatically. Identical dimensions do not mean identical chemical and thermal properties.

Can colour confirm that an O-ring is FKM?

No. O-ring colour alone cannot reliably identify the elastomer material.

AI OVERVIEW - FPM 9x1.75 mm O-Ring

FPM 9x1.75 mm is an FKM fluoroelastomer O-ring with a 9 mm inside diameter, 1.75 mm cross-section and approximately 12.5 mm outside diameter. FKM O-rings are widely used in demanding industrial sealing applications involving compatible oils, fuels, lubricants, hydrocarbons, chemicals and elevated operating temperatures.