O-ring 36x3 VMQ - Silicone Sealing Ring

O-ring 36x3 MVQ 70 ShA - Silicone Sealing Ring (Pack of 100)

O-ring 36x3 VMQ 70 ShA is a silicone sealing ring with a nominal inside diameter of 36 mm and a cross-section of 3 mm. It is manufactured from VMQ silicone rubber with a nominal hardness of 70 ShA. VMQ is used in sealing applications requiring good temperature flexibility and resistance to ozone, UV radiation, weathering and atmospheric ageing.

Technical data - O-ring 36x3 VMQ 70 ShA

What does O-ring 36x3 VMQ 70 ShA mean?

The designation identifies the principal dimensions, material and hardness of the sealing ring.

36 - nominal inside diameter of 36 mm.

3 - nominal cross-section diameter of 3 mm.

VMQ - silicone rubber used for elastomeric sealing elements.

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

The nominal O-ring size is therefore:

36x3 mm

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

VMQ or MVQ - which designation is correct?

The preferred technical abbreviation for this type of silicone rubber is:

VMQ

The designation MVQ can also be encountered in commercial product descriptions, older listings and online searches.

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

O-ring 36x3 VMQ 70 ShA

O-ring 36x3 MVQ 70 ShA

Silicone O-ring 36x3

For technical product identification, VMQ is the preferred material designation.

Dimensions of the 36x3 O-ring

The nominal dimensions are:

Inside diameter d1: 36 mm

Cross-section d2: 3 mm

Nominal size:

36x3 mm

Based on these nominal dimensions, the approximate uncompressed outside diameter is:

42 mm

This results from:

36 mm + 2 x 3 mm = 42 mm

The primary size used to identify the product remains 36x3 mm.

VMQ silicone rubber

VMQ belongs to the silicone rubber family and is widely used for elastomeric sealing elements.

Typical characteristics associated with VMQ include:

• very good flexibility at low temperatures

• good performance at elevated temperatures

• good resistance to ozone

• good resistance to UV radiation

• good resistance to weathering

• good resistance to atmospheric ageing

• good electrical insulating properties

These properties make VMQ useful where the sealing material must retain its elastomeric characteristics over a broad temperature range or where resistance to environmental ageing is important.

Operating temperature of VMQ

The permissible operating temperature of an O-ring depends on the exact silicone compound and operating conditions.

Typical standard VMQ compounds are associated with a broad temperature capability, but the exact operating limits of this specific 36x3 O-ring should be confirmed from the compound specification when temperature is a critical selection parameter.

Factors affecting the permissible temperature include:

• exact VMQ compound

• operating medium

• exposure time

• pressure

• static or dynamic operation

• seal design

A temperature limit should therefore not be selected solely from the general properties of silicone rubber.

What does 70 ShA mean?

70 ShA specifies the nominal hardness of the elastomer according to the Shore A scale.

O-ring hardness influences characteristics such as:

• deformation under compression

• behaviour in the sealing groove

• required compression

• response to system pressure

• resistance to extrusion

When selecting a replacement, the dimensions 36x3 mm alone are therefore insufficient. Material and hardness should also correspond to the requirements of the sealing system.

Chemical resistance of VMQ

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

Silicone rubber is particularly known for resistance to environmental influences such as:

• ozone

• oxygen

• UV radiation

• weathering

• atmospheric ageing

Compatibility with oils, fuels, solvents, acids, bases and other chemicals depends on the exact operating medium, concentration, temperature and silicone compound.

Chemical compatibility should therefore be checked before using a 36x3 VMQ O-ring with a specific medium.

O-ring design and sealing principle

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

When installed in a correctly designed groove, the ring is compressed between mating surfaces. This controlled deformation creates sealing contact pressure.

The effectiveness of the seal depends on factors including:

• groove geometry

• O-ring compression

• installation clearance

• mating surface quality

• pressure

• temperature

• operating medium

• static or dynamic movement

The 36x3 dimension alone does not define the complete operating capability of the sealing system.

O-ring 36x3 VMQ vs NBR

A 36x3 VMQ O-ring and a 36x3 NBR O-ring can have identical nominal dimensions while providing different operating properties.

VMQ is silicone rubber and is particularly valued for temperature flexibility and resistance to ozone, UV radiation and atmospheric ageing.

NBR is nitrile rubber with a different chemical, mechanical and temperature resistance profile and is commonly selected for contact with many mineral oils and greases.

A 36x3 NBR O-ring should therefore not be treated as an automatic replacement for a 36x3 VMQ O-ring.

O-ring 36x3 VMQ vs FKM

VMQ and FKM are different elastomer families.

VMQ is particularly associated with good low-temperature flexibility and resistance to atmospheric ageing.

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

Selection between VMQ and FKM should consider:

• operating medium

• temperature

• pressure

• static or dynamic operation

• groove design

• required hardness

• requirements of the specific application

Identical 36x3 mm dimensions do not guarantee material interchangeability.

Typical applications of VMQ O-rings

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

Silicone O-rings are particularly relevant where the application requires properties such as:

• flexibility at low temperatures

• performance at elevated temperatures

• resistance to ozone

• resistance to UV radiation

• resistance to weathering

• resistance to atmospheric ageing

These are typical application characteristics of VMQ material and should not be interpreted as confirmation that this specific O-ring is approved for every application or operating medium.

Alternative designations and reference formats

Natural designation and search variants include:

O-ring 36x3 VMQ 70 ShA

O-ring 36x3 MVQ 70 ShA

36x3 VMQ O-ring

36x3 MVQ O-ring

Silicone O-ring 36x3

Silicone sealing ring 36x3

O-ring 36x3 silicone

O-ring 36x3 silicone 70 ShA

O-ring VMQ 36x3 70 Shore A

O-ring MVQ 36x3 70 Shore A

36 mm ID x 3 mm CS O-ring

For technical material identification, VMQ is the preferred designation.

Selection and interchangeability

Before selecting or replacing the O-ring, check:

• inside diameter 36 mm

• cross-section 3 mm

• VMQ material

• hardness 70 ShA

• operating medium

• required temperature range

• pressure

• static or dynamic operation

• groove geometry

• required compression

• requirements of the specific sealing system

A 36x3 O-ring manufactured from NBR, FKM, EPDM or another elastomer is not automatically interchangeable with a 36x3 VMQ O-ring.

Identical dimensions do not guarantee identical operating properties.

Installation

Before installation, make sure that the groove and mating surfaces are clean and free from contaminants.

During installation, 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 required, it should be compatible with both the VMQ material and the operating medium.

Storage

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

Avoid storing the ring permanently stretched or strongly deformed.

Before installation, inspect the sealing surface for cuts, cracks or other visible damage.

FAQ - O-ring 36x3 VMQ 70 ShA

What are the dimensions of the O-ring 36x3?

The O-ring has a nominal inside diameter of 36 mm and a cross-section diameter of 3 mm. Its nominal size is 36x3 mm.

What is the approximate outside diameter of a 36x3 O-ring?

Based on the nominal dimensions, the approximate uncompressed outside diameter is 42 mm. The standard product designation remains 36x3 mm.

What does VMQ mean?

VMQ is the preferred technical designation for silicone rubber used in elastomeric sealing elements.

Is MVQ the same as VMQ?

MVQ can be encountered as an alternative commercial or search designation for silicone O-rings. VMQ is the preferred technical abbreviation used to identify silicone rubber.

What does 70 ShA mean?

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

Can a 36x3 NBR O-ring replace a 36x3 VMQ O-ring?

Not automatically. Although both O-rings may have identical dimensions, NBR and VMQ have different chemical, thermal and mechanical properties.

Can a 36x3 FKM O-ring replace a VMQ O-ring?

Not solely on the basis of dimensions. The operating medium, temperature, pressure, hardness and sealing-system requirements should be checked before changing elastomer material.

Is VMQ suitable for every oil or fuel?

No. Chemical compatibility depends on the specific fluid, temperature, exposure conditions and exact silicone compound.

O-ring 36x3 VMQ 70 ShA - key information

O-ring 36x3 VMQ 70 ShA is a silicone sealing ring with a 36 mm inside diameter and 3 mm cross-section. VMQ identifies silicone rubber, while 70 ShA specifies its nominal Shore A hardness. The material is particularly valued for temperature flexibility and resistance to ozone, UV radiation, weathering and atmospheric ageing.

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