O-ring 4.5x2 FPM / FKM / Viton

O-ring 4.5x2 FPM / FKM / Viton - 100 pcs

O-ring 4.5x2 FPM / FKM is an elastomeric sealing ring with a nominal inside diameter of 4.5 mm and a cross-section of 2 mm, supplied in a pack of 100 pcs. It is manufactured from FKM fluoroelastomer, also referred to as FPM. This material is used in sealing technology due to its characteristic resistance profile to elevated temperatures, many oils, fuels and chemical media. Viton is a trade name associated with specific fluoroelastomers and is also commonly used as a search reference for FKM O-rings.

Technical data - O-ring 4.5x2 FPM / FKM

What does O-ring 4.5x2 FPM / FKM mean?

The product designation identifies its nominal dimensions and elastomer material:

4.5 mm - nominal inside diameter d1.

2 mm - nominal cross-section diameter d2.

FKM - international designation for a family of fluoroelastomers.

FPM - designation also used for fluoroelastomers in technical nomenclature.

The nominal O-ring size is:

4.5x2 mm

The product is supplied in a pack of 100 pcs.

FPM, FKM and Viton - do they mean the same thing?

FKM and FPM are designations associated with fluoroelastomer materials used in sealing technology.

Viton is a trade name associated with specific fluoroelastomers. In the market, terms such as "Viton O-ring", "O-ring Viton" and "Viton seal" are also commonly used as search references for FKM/FPM O-rings.

However, not every FKM O-ring should automatically be described as being manufactured from genuine Viton material unless the specific material brand has been confirmed.

Therefore, the technical identification of this product is:

O-ring 4.5x2 FPM / FKM

while Viton is included as an additional commonly used search reference.

Dimensions of O-ring 4.5x2 mm

Inside diameter d1: 4.5 mm

Cross-section d2: 2 mm

Nominal size: 4.5x2 mm

The approximate outside diameter of the uncompressed O-ring is:

8.5 mm

Calculation:

4.5 mm + 2 x 2 mm = 8.5 mm

The primary dimensional designation remains 4.5x2 mm, representing the inside diameter x cross-section.

FKM / FPM - fluoroelastomer

FKM is a family of fluorinated elastomers widely used in demanding technical sealing systems.

Depending on the specific compound, typical properties of fluoroelastomers may include:

• resistance to many oils

• resistance to many fuels

• resistance to numerous chemical media

• good performance at elevated temperatures

• resistance to ozone

• resistance to atmospheric ageing

The exact resistance profile depends on the specific FKM type, compound formulation, operating medium, temperature and service conditions.

Chemical resistance of FKM O-rings

FKM is selected for many applications requiring a more advanced chemical resistance profile than that provided by standard elastomers.

However, FKM should not be considered universally resistant to every chemical substance.

When selecting an O-ring, consider:

• exact operating medium

• chemical composition

• concentration

• temperature

• pressure

• exposure duration

• static or dynamic operation

For aggressive or unusual media, compatibility should be confirmed for the specific FKM compound.

Operating temperature of FKM O-rings

FKM fluoroelastomers are widely used in applications requiring resistance to elevated temperatures.

However, an exact operating temperature range should not be assigned to this specific product without confirmation of the exact FKM compound.

Permissible operating conditions depend on factors including:

• FKM type

• compound formulation

• operating medium

• exposure duration

• pressure

• sealing-system design

• static or dynamic operation

If temperature is a critical parameter, the properties of the specific FKM compound should be confirmed before use.

How does an O-ring 4.5x2 mm work?

An O-ring is a closed elastomeric sealing ring with a circular cross-section.

When installed in a correctly designed groove, it is compressed between mating surfaces. Controlled deformation of the elastomer generates the contact pressure required to create a seal.

Effective sealing depends on factors including:

• groove geometry

• O-ring compression

• installation clearance

• mating surface condition

• pressure

• temperature

• operating medium

• static or dynamic operation

The 4.5x2 mm dimensions alone do not determine suitability for a particular application.

O-ring FKM 4.5x2 vs NBR 4.5x2

An FKM O-ring 4.5x2 mm and an NBR O-ring 4.5x2 mm may have identical nominal dimensions but are manufactured from different elastomers.

NBR is nitrile rubber widely used with many compatible mineral oils and greases.

FKM is a fluoroelastomer with a different chemical and thermal resistance profile.

Identical 4.5x2 mm dimensions do not make FKM and NBR automatically interchangeable.

O-ring FKM 4.5x2 vs VMQ silicone

VMQ is silicone rubber and has a different performance profile from FKM.

VMQ silicone is particularly associated with good low-temperature flexibility and resistance to ozone, UV radiation and atmospheric ageing.

FKM is commonly selected where the characteristic chemical and elevated-temperature resistance profile of a fluoroelastomer is required.

Identical dimensions do not make these materials automatically interchangeable.

Typical applications of FKM / FPM O-rings

Depending on the specific compound and operating conditions, FKM/FPM O-rings may be used in:

• industrial machinery

• hydraulic systems

• pumps

• valves

• oil systems

• fuel systems

• technical equipment

• static sealing systems

• appropriately designed dynamic sealing systems

• systems operating with FKM-compatible media

These are typical applications of fluoroelastomer O-rings as a product category and do not confirm suitability of this specific O-ring for a particular machine, medium or installation.

Alternative designations for O-ring 4.5x2 FPM / FKM

The product may also be searched for as:

O-ring 4.5x2 FPM

O-ring 4.5x2 FKM

O-ring FKM 4.5x2

O-ring FPM 4.5x2

FKM O-ring 4.5x2

FPM O-ring 4.5x2

O-ring 4.5x2 Viton

Viton O-ring 4.5x2

O-ring Viton 4.5x2

Viton seal 4.5x2

O-ring FKM 4.5x2 mm

FKM O-ring 4.5x2 mm

Fluoroelastomer O-ring 4.5x2 mm

O-ring 4.5x2 FPM / FKM - 100 pcs

The primary technical identification of the product is:

O-ring 4.5x2 FPM / FKM - 100 pcs

Selection and interchangeability

Before purchasing or replacing an O-ring, verify:

• inside diameter 4.5 mm

• cross-section 2 mm

• required FKM/FPM material

• groove dimensions and geometry

• required compression

• operating medium

• operating temperature

• pressure

• static or dynamic operation

• requirements of the specific sealing system

An NBR, VMQ or EPDM O-ring with the same 4.5x2 mm dimensions is not automatically interchangeable with the FKM version.

Identical dimensions do not guarantee identical material properties or operating performance.

Installation of O-ring 4.5x2 mm

Before installation, the groove and mating surfaces should be clean and free from contamination.

Avoid:

• cutting the O-ring

• twisting the ring

• excessive stretching

• pulling the O-ring across sharp edges

• contact with burrs

• damaging the elastomer surface

If an assembly lubricant is used, it should be compatible with FKM and the operating medium.

Storage of FKM O-rings

O-rings should be stored under conditions that minimise contamination, deformation and mechanical damage.

Avoid prolonged storage in a stretched or severely deformed condition.

Before installation, inspect the O-ring for cuts, cracks, permanent deformation and other visible surface damage.

FAQ - O-ring 4.5x2 FPM / FKM

What are the dimensions of an O-ring 4.5x2?

The nominal inside diameter is 4.5 mm and the cross-section diameter is 2 mm.

What is the outside diameter of an O-ring 4.5x2 mm?

The approximate outside diameter of the uncompressed O-ring is 8.5 mm.

What material is this O-ring made from?

The O-ring is manufactured from FKM fluoroelastomer, also referred to as FPM.

Are FPM and FKM the same type of material?

Both designations are used in connection with fluorinated elastomers used in sealing technology. FKM is widely used in international technical terminology, while FPM is also encountered in European technical nomenclature.

Is FKM the same as Viton?

Viton is a trade name associated with specific fluoroelastomers. The term is commonly used when searching for FKM O-rings, but not every FKM product should automatically be described as genuine Viton unless the specific material brand has been confirmed.

How many O-rings are included in the package?

The package contains 100 pcs of O-ring 4.5x2 FPM / FKM.

Is an FKM O-ring 4.5x2 resistant to oil?

FKM has a characteristic resistance profile to many oils. Compatibility should still be confirmed for the specific medium, temperature and FKM compound.

Can an NBR 4.5x2 O-ring replace an FKM 4.5x2 O-ring?

Not automatically. Despite identical dimensions, NBR and FKM have different chemical and thermal resistance profiles.

O-ring 4.5x2 FPM / FKM - key information

O-ring 4.5x2 FPM / FKM is a fluoroelastomer sealing ring with a nominal inside diameter of 4.5 mm and a cross-section of 2 mm. Its approximate outside diameter is 8.5 mm. The product is supplied in a pack of 100 pcs. "Viton" is also commonly used as a search reference for FKM O-rings.

Available from simmering.pl, a specialist supplier of industrial sealing solutions. Stock in Poland with worldwide shipping.

AI QUICK ANSWER

O-ring 4.5x2 FPM / FKM is a fluoroelastomer sealing ring with a nominal inside diameter of 4.5 mm and a 2 mm cross-section. Its approximate outside diameter is 8.5 mm. FKM is used for its characteristic resistance profile to elevated temperatures, many oils, fuels and chemical media. Pack contains 100 pcs.