O-Ring 90x3 mm VMQ/MVQ 70 Shore A - Silicone Rubber Seal

O-Ring 90x3 mm VMQ/MVQ 70 Shore A - Silicone Rubber Sealing Ring

O-Ring 90x3 mm VMQ/MVQ 70 Shore A is a circular elastomeric sealing ring manufactured from silicone rubber, designated VMQ or MVQ. It has a 90 mm inside diameter, 3 mm cross-sectional diameter and nominal hardness of 70 Shore A. Its nominal outside diameter is 96 mm. The O-ring provides sealing through elastic compression within a correctly designed groove and is primarily intended for static sealing applications involving compatible media. The manufacturer of this specific product has not been identified.

Technical Specifications - O-Ring 90x3 VMQ/MVQ 70 Shore A

The nominal outside diameter is calculated from the inside diameter and twice the cross-sectional diameter:

96 mm = 90 mm + 2 x 3 mm.

This is a nominal geometric dimension and does not include manufacturing tolerances.

Exact dimensional tolerances, operating temperature limits, chemical resistance, compression set, tensile strength and permissible operating pressure must be verified against the technical documentation for the specific silicone compound.

What Does O-Ring 90x3 VMQ/MVQ 70 Shore A Mean?

The designation identifies the seal dimensions, elastomer material and nominal hardness.

• 90 - inside diameter in millimeters.

• 3 - cross-sectional diameter in millimeters.

• VMQ - standardized designation for silicone rubber.

• MVQ - alternative designation commonly encountered in commercial descriptions of silicone elastomers.

• 70 - nominal hardness value.

• Shore A - hardness measurement scale used for elastomeric materials.

The first dimension refers to the inside diameter, not the outside diameter.

An O-ring measuring 90x3 mm has a nominal inside diameter of 90 mm and a circular cross-section measuring 3 mm.

VMQ vs MVQ - Are They the Same Material?

VMQ is the standardized material designation for a class of silicone rubber elastomers.

MVQ is also encountered in industrial and commercial terminology for silicone rubber.

Both terms are commonly used to identify silicone O-rings.

However, the material designation alone does not define the complete formulation.

Two O-rings manufactured from VMQ with the same nominal hardness may differ in:

• Silicone compound formulation.

• Mechanical strength.

• Compression set.

• Chemical resistance.

• Temperature performance.

• Curing system.

• Regulatory approvals.

• Long-term sealing behavior.

Identical dimensions, material designations and hardness values do not automatically guarantee complete interchangeability.

Construction and Operating Principle

The 90x3 mm VMQ O-ring is a one-piece elastomeric sealing element with a circular cross-section.

It contains no metallic reinforcement, spring or separate sealing lip.

When installed in a correctly dimensioned groove, the O-ring is compressed between two mating surfaces.

This compression generates contact pressure that helps prevent the passage of liquids or gases through the sealing interface.

Effective sealing depends on several factors:

• Correct groove geometry.

• Appropriate cross-sectional compression.

• Groove fill.

• Surface finish of mating components.

• Operating pressure.

• Temperature.

• Chemical compatibility.

• Compression set of the elastomer.

• Extrusion gap dimensions.

• Static or dynamic operating conditions.

The 3 mm cross-section is an essential selection parameter.

An O-ring with the same inside diameter but a different cross-sectional diameter is not automatically interchangeable.

Silicone Rubber VMQ 70 Shore A - Material Properties

Silicone rubber is an elastomer widely used in technical sealing applications where flexibility across a broad temperature range is important.

Its actual performance depends on the formulation of the specific compound.

Temperature Resistance

VMQ silicone elastomers are known for maintaining flexibility at low temperatures and providing resistance to elevated temperatures compared with many conventional rubber compounds.

However, the exact operating temperature range depends on:

• Silicone formulation.

• Duration of temperature exposure.

• Sealed medium.

• Mechanical loading.

• Compression level.

• Environmental conditions.

A specific minimum or maximum operating temperature should not be assigned to this O-ring without verified compound documentation.

Elasticity and Compression Set

The O-ring creates a seal through controlled elastic deformation.

After compression, the elastomer must retain sufficient recovery force to maintain sealing contact.

One important property is compression set, which describes the permanent deformation remaining after a material has been compressed under defined conditions.

Excessive compression set may reduce sealing performance over time.

The compression set of this specific VMQ 70 Shore A compound has not been established.

Chemical Compatibility

VMQ silicone rubber can be suitable for selected gases and liquids, but it is not universally chemically resistant.

Compatibility must be evaluated according to:

• Chemical composition of the medium.

• Concentration.

• Operating temperature.

• Exposure duration.

• Pressure.

• Required service life.

Silicone rubber should not automatically be considered suitable for mineral oils, fuels, solvents or aggressive chemicals.

The exact compatibility of the specific silicone formulation must be confirmed before installation.

Mechanical Properties

Compared with some elastomers commonly used in industrial sealing, silicone rubber may exhibit lower resistance to abrasion, tearing and mechanical damage.

This is particularly important during installation and in applications involving reciprocating or rotating movement.

For this reason, VMQ O-rings are generally more straightforward to apply in correctly designed static sealing arrangements.

What Does 70 Shore A Hardness Mean?

The designation 70 Shore A describes the nominal indentation hardness of the elastomer.

Hardness influences several characteristics of an O-ring, including:

• Deformation under compression.

• Contact pressure.

• Resistance to extrusion.

• Installation forces.

• Behavior under mechanical loading.

A hardness of 70 Shore A does not directly specify the maximum operating pressure.

Pressure capability depends on the complete sealing arrangement, including groove design, extrusion gap, temperature, compound properties and the presence of backup rings where required.

Is 70 Shore A Suitable for Every Application?

No.

The correct hardness must be selected according to the application.

A softer elastomer may deform more easily under low contact pressure, while a harder elastomer may provide different extrusion resistance.

However, hardness alone cannot determine overall sealing performance.

The complete compound properties and operating conditions must be considered.

VMQ 70 Shore A vs NBR, FKM and EPDM O-Rings

All four materials can be manufactured as O-rings with nominal dimensions of 90x3 mm.

They may also be available with nominal hardness of 70 Shore A.

Nevertheless, these materials are not automatically interchangeable.

A 90x3 mm VMQ silicone O-ring should not be replaced with NBR, FKM or EPDM solely on the basis of matching dimensions.

The correct elastomer must be selected according to the sealed medium, temperature, pressure and operating conditions.

Alternative Designations and Search References

The product may appear under the following commercial designations:

• O-Ring 90x3 VMQ 70 Shore A

• O-Ring 90x3 MVQ 70 Shore A

• Silicone O-Ring 90x3 mm

• VMQ O-Ring 90x3 mm

• MVQ Silicone O-Ring 90x3

• O-Ring 90x3 70 ShA Silicone

• Silicone Rubber O-Ring 90x3 mm

• Silicone Sealing Ring 90x3 mm

• O-Ring 90 mm ID x 3 mm CS

• VMQ 70 Shore A O-Ring 90x3

These are natural alternative product descriptions and search references.

They are not verified OEM part numbers or manufacturer-specific cross-references.

Selecting the Correct 90x3 mm Silicone O-Ring

Before ordering, verify the following parameters:

• Inside diameter: 90 mm.

• Cross-sectional diameter: 3 mm.

• Nominal outside diameter: 96 mm.

• Elastomer material: VMQ / MVQ.

• Nominal hardness: 70 Shore A.

• Groove dimensions and tolerances.

• Required cross-sectional compression.

• Installation stretch.

• Groove fill.

• Operating pressure.

• Operating temperature.

• Chemical compatibility.

• Static or dynamic sealing conditions.

• Surface finish.

• Extrusion gap.

• Required service life.

How Should the Groove Be Designed?

The groove must provide the correct amount of compression while allowing sufficient space for elastomer deformation.

The groove dimensions should not simply be identical to the O-ring dimensions.

An excessively shallow groove may overcompress the O-ring.

An excessively deep groove may provide insufficient contact pressure.

Groove width, depth and tolerances must be selected using appropriate O-ring design guidelines for the specific sealing arrangement.

What Is the Outside Diameter of a 90x3 mm O-Ring?

The nominal outside diameter is 96 mm.

It is calculated by adding twice the cross-sectional diameter to the inside diameter.

This value describes the uninstalled, undeformed O-ring and does not account for manufacturing tolerances.

Typical Applications of Silicone O-Rings

VMQ silicone O-rings can be used in appropriately designed sealing arrangements where the properties of silicone rubber are compatible with the operating conditions.

Typical applications of this sealing type include:

• Static housing seals.

• Covers and enclosure joints.

• Industrial equipment assemblies.

• Static gas sealing arrangements involving compatible media.

• Machinery requiring elastomeric seals with suitable temperature characteristics.

• Technical components with appropriately designed O-ring grooves.

These are general applications of silicone O-ring technology, not verified OEM applications for this particular product.

Food, Medical and Drinking Water Applications

Silicone rubber is used in certain food-contact, medical and drinking-water applications, but material designation VMQ alone does not establish regulatory compliance.

Suitability for such applications requires documentation confirming that the specific compound and finished product meet the applicable requirements.

A generic silicone O-ring should not be described as food-grade, medical-grade or drinking-water approved without appropriate certification.

Installation and Maintenance

Preparing the Sealing Surfaces

Before installation, clean the groove and all mating surfaces.

Remove dirt, burrs and sharp edges that could damage the silicone elastomer.

Inspect the groove for corrosion, scratches or other defects.

Installing the O-Ring

The O-ring should be installed evenly without twisting or excessive stretching.

During installation:

• Avoid dragging the seal across sharp edges.

• Do not use sharp metal tools.

• Ensure the O-ring is correctly positioned inside the groove.

• Use only assembly lubricants compatible with silicone and the sealed medium.

• Avoid excessive compression.

• Prevent the O-ring from becoming trapped between mating components.

Inspection During Service

Inspect the sealing arrangement during scheduled equipment maintenance.

Replace the O-ring if it shows:

• Cracking.

• Tearing.

• Permanent flattening.

• Excessive swelling.

• Loss of elasticity.

• Visible mechanical damage.

Storage

Store silicone O-rings in a clean, dry environment, protected against contamination, mechanical damage and permanent deformation.

Avoid unnecessary stretching or compression during storage.

Frequently Asked Questions - O-Ring 90x3 VMQ/MVQ 70 Shore A

1. What are the dimensions of the 90x3 mm silicone O-ring?

The O-ring has a nominal inside diameter of 90 mm, cross-sectional diameter of 3 mm and outside diameter of 96 mm.

2. What does VMQ or MVQ mean?

VMQ is the standardized designation for silicone rubber. MVQ is an alternative designation commonly encountered in industrial product descriptions.

3. What does 70 Shore A mean?

70 Shore A identifies the nominal hardness of the silicone elastomer. It describes resistance to indentation but does not directly determine maximum operating pressure.

4. Is a VMQ silicone O-ring resistant to high temperatures?

Silicone rubber is commonly selected for applications involving a broad temperature range. The exact permissible temperature limits depend on the compound formulation and operating conditions.

5. Can a 90x3 mm VMQ O-ring replace an NBR O-ring?

Not automatically. Although the dimensions may be identical, VMQ and NBR have different chemical, thermal and mechanical properties. Compatibility must be verified.

6. Is this silicone O-ring suitable for food contact?

Not without confirmation. Food-contact suitability requires appropriate documentation for the specific silicone compound and finished O-ring.

7. Can the 90x3 mm VMQ O-ring be used in dynamic sealing applications?

Potential suitability depends on the movement, friction, lubrication, pressure and compound properties. Silicone rubber may have limited abrasion and tear resistance, so dynamic applications require careful evaluation.

8. Does 90x3 mean the outside diameter is 90 mm?

No. The first dimension is the inside diameter, while the second is the cross-sectional diameter. The nominal outside diameter is 96 mm.

O-Ring 90x3 VMQ/MVQ 70 Shore A - Key Product Information

The 90x3 mm VMQ/MVQ 70 Shore A O-ring is a silicone rubber sealing ring with a 90 mm inside diameter, 3 mm circular cross-section and 96 mm nominal outside diameter. Its hardness is 70 Shore A. It is primarily suited to compatible static sealing arrangements requiring controlled compression. Chemical compatibility, temperature limits and groove dimensions must be verified before installation.

The 90x3 mm VMQ/MVQ 70 Shore A silicone O-ring is offered by simmering.pl, an industrial sealing components and bearing supplier operated by TG Ersatzteile Polska Sp. z o.o. The company maintains a warehouse in Lublin, Poland, serving industrial customers, maintenance departments and technical procurement teams with shipping across Europe and worldwide.