O-ring 5.7x1.9 VMQ 70 ShA

O-ring 5.7x1.9 VMQ 70 ShA - 100 pcs

O-ring 5.7x1.9 VMQ 70 ShA is a silicone sealing ring with an inside diameter of 5.7 mm and a cross-section of 1.9 mm, supplied in a pack of 100 pcs. The O-ring 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 5.7x1.9 VMQ 70 ShA

What does O-ring 5.7x1.9 VMQ 70 ShA mean?

The designation identifies the main dimensions, material and hardness of the O-ring.

5.7 - inside diameter of 5.7 mm.

1.9 - cross-section diameter of 1.9 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:

5.7x1.9 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 catalogues and online searches.

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

O-ring 5.7x1.9 VMQ 70 ShA

or:

O-ring 5.7x1.9 MVQ 70 ShA

For technical identification, VMQ is the preferred material designation.

Dimensions of the 5.7x1.9 O-ring

The nominal dimensions are:

Inside diameter d1: 5.7 mm

Cross-section d2: 1.9 mm

Nominal size:

5.7x1.9 mm

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

9.5 mm

This results from:

5.7 mm + 2 x 1.9 mm = 9.5 mm

The primary product size remains 5.7x1.9 mm.

VMQ silicone rubber

VMQ is a silicone rubber used for technical 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 resistance to ageing

• good electrical insulating properties

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

For typical standard VMQ 70 ShA silicone compounds, an approximate material temperature range of:

-50°C to +175°C

can be encountered.

This range should not be treated as a guaranteed operating parameter for every 5.7x1.9 VMQ O-ring.

The actual permissible operating temperature depends on factors including:

• the specific VMQ compound

• operating medium

• exposure time

• pressure

• seal design

• type of operation

For demanding applications, the properties of the specific silicone compound should be verified.

What does 70 ShA mean?

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

Material hardness affects characteristics including:

• O-ring deformation

• behaviour in the sealing groove

• required compression

• behaviour under pressure

• resistance to extrusion

When selecting an equivalent product, check not only the 5.7x1.9 mm dimensions and VMQ material but also the required hardness of 70 ShA.

Chemical resistance of VMQ

VMQ silicone is not a universal sealing material for every operating medium.

VMQ provides good resistance to:

• ozone

• oxygen

• UV radiation

• weathering

• atmospheric ageing

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

Before using the O-ring in contact with a particular substance, the chemical compatibility of VMQ should be checked.

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 O-ring is compressed between the mating surfaces. The resulting deformation of the elastomer generates sealing contact pressure.

Effective sealing depends on factors including:

• groove geometry

• O-ring compression

• installation clearance

• surface finish

• pressure

• temperature

• operating medium

• type of movement

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

O-ring 5.7x1.9 VMQ vs NBR

A 5.7x1.9 VMQ O-ring and a 5.7x1.9 NBR O-ring may have identical dimensions but are manufactured from different elastomers.

VMQ is silicone rubber characterised by a wide temperature capability, very good 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.

Identical dimensions of 5.7x1.9 mm therefore do not mean that NBR and VMQ O-rings are automatically interchangeable.

O-ring 5.7x1.9 VMQ vs FKM

VMQ and FKM belong to different elastomer families and provide different operating properties.

VMQ 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 take into account:

• operating medium

• temperature

• pressure

• static or dynamic operation

• sealing system design

• requirements of the specific application

A 5.7x1.9 FKM O-ring is not automatically interchangeable with a 5.7x1.9 VMQ O-ring.

Typical applications

VMQ O-rings can be used 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

• resistance to elastomer ageing

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

Alternative designations and reference formats

Natural designation and search variants include:

O-ring 5.7x1.9 VMQ 70 ShA

O-ring 5.7x1.9 MVQ 70 ShA

5.7x1.9 VMQ O-ring 70 ShA

5.7x1.9 MVQ O-ring 70 ShA

Silicone O-ring 5.7x1.9

Silicone O-ring 5.7x1.9 mm

O-ring 5.7x1.9 silicone 70 ShA

O-ring VMQ 5.7x1.9 70 Shore A

O-ring MVQ 5.7x1.9 70 Shore A

O-ring 5.7x1.9 VMQ - 100 pcs

O-ring 5.7x1.9 MVQ - 100 pcs

5.7 mm ID x 1.9 mm CS silicone O-ring

For technical material identification, VMQ is the preferred designation.

Selection and interchangeability

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

• inside diameter 5.7 mm

• cross-section 1.9 mm

• VMQ material

• hardness 70 ShA

• operating temperature

• operating medium

• pressure

• static or dynamic operation

• groove design

• requirements of the specific application

A 5.7x1.9 O-ring manufactured from NBR, FKM, EPDM or another elastomer is not automatically interchangeable with a 5.7x1.9 VMQ O-ring.

Installation

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

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 used, it must be compatible with both VMQ and the operating medium.

Storage

O-rings should be stored under 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 5.7x1.9 VMQ 70 ShA

What are the dimensions of the 5.7x1.9 O-ring?

The O-ring has an inside diameter of 5.7 mm and a cross-section diameter of 1.9 mm. Its nominal size is 5.7x1.9 mm.

How many O-rings are included in the package?

The package contains 100 pcs of 5.7x1.9 VMQ 70 ShA silicone O-rings.

What does VMQ mean?

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

Do VMQ and MVQ both refer to silicone?

Both forms can be encountered in commercial listings and online searches, but VMQ is the preferred 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 5.7x1.9 O-ring?

Based on its nominal dimensions, the approximate uncompressed outside diameter is 9.5 mm. The standard product size remains 5.7x1.9 mm.

Can a 5.7x1.9 NBR O-ring replace a 5.7x1.9 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 should be checked for the specific fluid, temperature and silicone compound.

O-ring 5.7x1.9 VMQ 70 ShA - key information

O-ring 5.7x1.9 VMQ 70 ShA is a silicone sealing ring with a 5.7 mm inside diameter and 1.9 mm cross-section, supplied in a pack of 100 pcs. VMQ identifies silicone rubber and 70 ShA its nominal Shore A hardness. The material provides a wide temperature range and good resistance to ozone, UV radiation and atmospheric ageing.

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