O-ring 32x4 VMQ 70 ShA

O-ring 32x4 VMQ 70 ShA - 100 pcs

O-ring 32x4 VMQ 70 ShA is a metric silicone sealing ring with an inside diameter of 32 mm and a cross-section of 4 mm, supplied in a pack of 100 pcs. It is manufactured from VMQ silicone rubber with a nominal hardness of 70 ShA. VMQ provides a wide service temperature range and good resistance to ageing, ozone, UV radiation and weathering.

Technical data - O-ring 32x4 VMQ 70 ShA

What does O-ring 32x4 VMQ 70 ShA mean?

The designation identifies the main dimensions and material properties of the seal.

32 - inside diameter of 32 mm.

4 - cross-section diameter of 4 mm.

VMQ - silicone rubber used for elastomeric sealing elements.

70 ShA - nominal material hardness measured on the Shore A scale.

100 pcs - package quantity.

The nominal O-ring size is therefore:

32x4 mm

The first value represents the inside diameter and the second represents the cross-section diameter.

VMQ or MVQ - which designation is correct?

The standard technical abbreviation for silicone rubber used in sealing technology is:

VMQ

The abbreviation MVQ can also be found in commercial descriptions, older listings and online searches.

For this reason, the product may be searched for as:

O-ring 32x4 VMQ 70 ShA

or:

O-ring 32x4 MVQ 70 ShA

For technical identification, VMQ is the preferred material designation.

Dimensions of the 32x4 O-ring

The nominal dimensions are:

Inside diameter d1: 32 mm

Cross-section d2: 4 mm

Nominal size:

32x4 mm

The approximate outside diameter of an uncompressed O-ring calculated from its nominal dimensions is:

40 mm

This results from:

32 mm + 2 x 4 mm

The primary commercial size remains 32x4 mm.

VMQ silicone rubber

VMQ is a silicone rubber widely used for elastomeric sealing elements.

Characteristic properties of VMQ include:

• very good low-temperature flexibility

• good high-temperature performance

• good ozone resistance

• good UV resistance

• good weathering resistance

• good electrical insulating properties

• good resistance to ageing

These characteristics make silicone O-rings suitable for applications where elastomer flexibility over a wide temperature range and resistance to atmospheric ageing are important.

Operating temperature of VMQ 70 ShA

Technical documentation for standard VMQ 70 Shore A compounds indicates a broad material temperature range.

A typical standard VMQ 70 ShA compound may be suitable for temperatures of approximately:

-50°C to +175°C

The actual permissible operating temperature of a specific O-ring depends on the exact silicone compound, operating medium, exposure time, pressure and application conditions.

The general temperature capability of VMQ should therefore not automatically be treated as the guaranteed operating range of every 32x4 silicone O-ring.

What does 70 ShA mean?

70 ShA indicates the nominal hardness of the elastomer measured on the Shore A scale.

It is a commonly used hardness class for technical O-rings.

Hardness affects characteristics such as:

• deformation under compression

• behaviour in the sealing groove

• required compression

• resistance to extrusion

• sealing behaviour under pressure

When selecting an equivalent product, check not only the 32x4 mm dimensions and VMQ material but also the specified hardness of 70 ShA.

Chemical resistance of VMQ silicone

VMQ is not a universal material for every fluid or chemical.

Selection of a silicone O-ring should always take into account the operating medium, temperature and working conditions.

VMQ offers very good resistance to ozone, oxygen, UV radiation and atmospheric ageing.

Compatibility with oils, fuels, solvents, acids and other chemicals depends on the specific medium and silicone compound.

A seal should therefore not be selected solely because it is described as "silicone".

Chemical compatibility with VMQ should be verified for the specific operating medium before installation.

O-ring design and sealing principle

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

When installed in a correctly designed groove, the ring is compressed between the mating surfaces.

The resulting deformation of the elastomer generates sealing contact pressure.

O-rings can be used in appropriately designed static and dynamic sealing arrangements.

Effective sealing depends not only on the O-ring itself but also on:

• groove geometry

• compression

• installation clearance

• surface finish

• pressure

• temperature

• operating medium

• type of movement

O-ring 32x4 VMQ vs NBR

A 32x4 VMQ O-ring and a 32x4 NBR O-ring may have identical dimensions, but they are manufactured from different elastomers.

VMQ is silicone rubber and is particularly characterised by its wide temperature capability, low-temperature flexibility and resistance to ozone, UV radiation and atmospheric ageing.

NBR is nitrile rubber with a different chemical, thermal and mechanical resistance profile.

A VMQ O-ring should therefore not automatically be replaced with an NBR O-ring simply because both have dimensions of 32x4 mm.

O-ring 32x4 VMQ vs FKM

VMQ and FKM belong to different elastomer families.

VMQ silicone rubber provides very good low-temperature flexibility and resistance to atmospheric ageing.

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

Selection between VMQ and FKM should be based primarily on:

• operating temperature

• operating medium

• pressure

• static or dynamic operation

• required service life

• sealing system design

Identical dimensions of 32x4 mm do not mean identical operating properties.

Typical applications

VMQ O-rings can be used as sealing elements in appropriately designed static and dynamic sealing arrangements.

Silicone is particularly useful where the application requires:

• low-temperature flexibility

• elevated-temperature capability

• ozone resistance

• UV resistance

• weathering resistance

• elastomer flexibility over a wide temperature range

For contact with a specific operating medium, the chemical compatibility of VMQ should always be checked before use.

Selection and interchangeability

Before purchasing or selecting an equivalent O-ring, check:

• inside diameter 32 mm

• cross-section 4 mm

• VMQ material

• hardness 70 ShA

• operating temperature

• operating medium

• pressure

• static or dynamic operation

• groove design

• requirements of the specific application

A 32x4 O-ring manufactured from NBR, EPDM, FKM or another elastomer is not automatically interchangeable with a 32x4 VMQ O-ring.

Alternative designations and reference formats

Natural designation and search variants include:

O-ring 32x4 VMQ 70 ShA - 100 pcs

O-ring 32x4 MVQ 70 ShA - 100 pcs

32x4 VMQ O-ring 70 ShA

32x4 MVQ O-ring 70 ShA

O-ring 32x4 silicone 70 ShA

Silicone O-ring 32x4 mm

O-ring VMQ 32x4 70 Shore A

O-ring MVQ 32x4 70 Shore A

32 mm ID x 4 mm CS silicone O-ring

32x4 silicone O-rings - 100 pcs

For technical material identification, VMQ is the preferred designation.

Installation

Before installation, check that the groove and mating surfaces are clean.

The O-ring should not be pulled across sharp edges, burrs or damaged surfaces.

During installation, avoid:

• cutting the O-ring

• twisting the ring

• excessive stretching

• damaging the elastomer surface

• contact with incompatible installation lubricants

An assembly lubricant may only be used when it is compatible with both VMQ and the operating medium.

Storage

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

The seals should not be stored permanently stretched or strongly deformed.

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

FAQ - O-ring 32x4 VMQ 70 ShA

What are the dimensions of the 32x4 O-ring?

The O-ring has an inside diameter of 32 mm and a cross-section diameter of 4 mm. Its nominal size is 32x4 mm.

What does VMQ mean?

VMQ is the standard technical designation for silicone rubber used in elastomeric sealing products.

Do VMQ and MVQ both refer to silicone?

Both forms can be encountered in commercial listings and searches, but VMQ is the preferred standard technical designation for silicone rubber.

What does 70 ShA mean?

70 ShA indicates the nominal hardness of the silicone elastomer measured on the Shore A scale.

What is the outside diameter of a 32x4 O-ring?

Based on its nominal dimensions, the approximate uncompressed outside diameter is 40 mm. The standard product size remains 32x4 mm.

What is the temperature range of VMQ?

Standard VMQ 70 ShA compounds can have a material temperature range of approximately -50°C to +175°C. The actual permissible operating range depends on the specific compound, medium and application conditions.

Can a 32x4 NBR O-ring replace a 32x4 VMQ O-ring?

Not automatically. Although the dimensions may be identical, NBR and VMQ have different chemical, temperature and mechanical properties.

Is VMQ suitable for all oils and fuels?

No. Compatibility must be checked for the specific fluid, temperature and silicone compound. The fact that an O-ring is made from silicone does not make it compatible with every oil, fuel or chemical.

O-ring 32x4 VMQ 70 ShA - key information

O-ring 32x4 VMQ 70 ShA is a silicone sealing ring with a 32 mm inside diameter and 4 mm cross-section, supplied in a pack of 100 pcs. VMQ identifies silicone rubber and 70 ShA its nominal Shore A hardness. The material offers a wide temperature range and good resistance to ozone, UV radiation and weathering.

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