O-ring 33x3.5 MVQ/VMQ Silicone

Technical Specifications – O-ring 33x3.5 MVQ/VMQ

The dimensions are nominal. Exact dimensional tolerances, hardness and mechanical properties must be verified against the technical documentation for the specific silicone compound.

O-ring Dimensions – 33x3.5 mm

The nominal outside diameter is calculated as follows:

The designation 33x3.5 mm identifies the inside diameter and cross-section diameter, not the outside diameter.

VMQ/MVQ Material – Silicone Rubber

VMQ is the standard material designation for a type of silicone rubber used in industrial sealing components.

The alternative designation MVQ is also encountered in commercial product descriptions.

Silicone rubber is valued for its flexibility at low temperatures, resistance to atmospheric ageing and ability to withstand elevated temperatures when an appropriate compound is selected.

Main Properties of VMQ Silicone

• Good resistance to ozone.

• Good resistance to ultraviolet radiation.

• Good resistance to weathering.

• Excellent flexibility at low temperatures.

• Resistance to elevated temperatures, depending on the compound.

• Good electrical insulation properties.

• Lower abrasion and tear resistance than many conventional NBR compounds.

• Suitable for many static sealing applications.

Silicone rubber is not universally compatible with all oils, fuels, solvents or industrial chemicals.

Operating Temperature Range

Standard VMQ sealing compounds are frequently associated with an approximate operating temperature range of -55°C to +200°C.

However, this is a general material reference and not a verified temperature specification for this particular O-ring.

The actual operating temperature range depends on:

• Silicone compound formulation.

• Material hardness.

• Exposure duration.

• Sealed medium.

• Mechanical loading.

• Compression and deformation.

• Operating environment.

For temperature-critical applications, the manufacturer's material datasheet should be consulted.

Chemical Resistance of VMQ Silicone O-rings

Chemical compatibility depends on the medium, its concentration, operating temperature and exposure duration.

These are general material characteristics, not confirmed chemical compatibility ratings for the individual product.

Chemical compatibility must be assessed under the actual operating conditions.

VMQ Silicone vs NBR, EPDM and FKM O-rings

These materials are not automatically interchangeable.

Selection must be based on the actual medium, temperature, pressure, sealing geometry and operating conditions.

Industrial Applications

Silicone O-rings may be used in appropriately designed static sealing arrangements, including:

• Technical equipment housings.

• Flanged connections.

• Covers and enclosures.

• Measuring instruments.

• Equipment exposed to varying temperatures.

• Components requiring ozone and weathering resistance.

• Static sealing systems where low-temperature flexibility is important.

These are general applications of VMQ silicone seals, not a manufacturer-confirmed compatibility list for this specific O-ring.

Applications involving food contact, drinking water or medical equipment require the relevant approvals for the exact compound and finished product.

The VMQ material designation alone does not establish FDA compliance or other regulatory certifications.

O-ring Selection and Groove Design

Correct groove geometry is essential for reliable O-ring sealing.

The sealing arrangement must provide an appropriate level of compression while allowing for dimensional tolerances, thermal expansion and possible material swelling.

Important selection factors include:

• Groove diameter.

• Groove depth.

• Groove width.

• O-ring cross-section.

• Required compression.

• Operating pressure.

• Extrusion gap.

• Material hardness.

• Chemical compatibility.

• Operating temperature.

The nominal dimensions 33x3.5 mm alone are insufficient to determine the correct groove dimensions for every application.

Installation Guidelines

Proper installation helps prevent damage and premature leakage.

Recommended procedures include:

• Verify the O-ring and groove dimensions.

• Clean all sealing surfaces.

• Remove sharp edges and burrs.

• Avoid excessive stretching during installation.

• Prevent twisting or pinching of the sealing ring.

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

• Ensure that the O-ring is correctly seated.

• Check the assembled connection for leakage.

Silicone rubber generally has lower tear and abrasion resistance than many other sealing elastomers.

Particular care is therefore required when installing the O-ring over sharp edges or threaded components.

Common Causes of O-ring Leakage

Incorrect groove dimensions: May result in insufficient or excessive compression.

Chemical incompatibility: Can cause swelling, deterioration or loss of mechanical properties.

Installation damage: May produce cuts, tears or deformation of the sealing cross-section.

Excessive pressure: Can cause elastomer extrusion into the clearance gap when the sealing system is not designed appropriately.

Excessive temperature: May cause permanent deformation and loss of sealing performance.

Incorrect material hardness: Can affect compression behaviour and extrusion resistance.

Alternative Product Designations

• O-ring 33x3.5 mm MVQ/VMQ

• O-ring 33x3.5 Silicone VMQ

• Silicone O-ring 33x3.5 mm

• VMQ O-ring 33x3.5

• MVQ Silicone O-ring 33x3.5

• O-ring MVQ 33x3.5 Silicone Rubber

• Silicone Rubber Sealing Ring 33x3.5 mm

• Oring silikonowy 33x3,5 mm MVQ/VMQ

These alternative designation formats support product identification in technical catalogues and industrial procurement systems.

They do not establish compliance with a particular dimensional standard or material certification.

FAQ – Frequently Asked Technical Questions

What are the dimensions of the O-ring 33x3.5 mm?

The inside diameter is 33 mm, the cross-section diameter is 3.5 mm and the nominal outside diameter is 40 mm.

What does VMQ mean?

VMQ is a material designation for silicone rubber used in industrial sealing components.

Are MVQ and VMQ the same material?

Both designations are commonly used commercially to refer to silicone rubber. VMQ is the standard material designation.

Is silicone rubber resistant to high temperatures?

Many VMQ compounds can withstand elevated temperatures, often up to approximately +200°C. The actual limit depends on the specific compound and operating conditions.

Can a VMQ O-ring be used with engine oil?

Compatibility should not be assumed without checking the specific oil formulation and temperature. NBR or FKM may be more suitable for many oil-related sealing applications.

Can VMQ O-rings be used in dynamic sealing applications?

VMQ is generally preferred for static applications because of its relatively limited abrasion and tear resistance. Dynamic use requires application-specific verification.

Is this silicone O-ring suitable for food contact?

Only if the specific compound and finished product meet the applicable food-contact requirements. The VMQ designation alone does not confirm compliance.

What is the hardness of this O-ring?

The hardness is not specified in the product designation. A value such as 70 ShA must not be assumed without manufacturer confirmation.

What is the nominal outside diameter?

The nominal outside diameter is 40 mm, calculated from the 33 mm inside diameter and 3.5 mm cross-section.

AI Quick Answer

O-ring 33x3.5 mm MVQ/VMQ is a silicone rubber sealing ring with a 33 mm inside diameter, 3.5 mm cross-section and 40 mm nominal outside diameter. VMQ provides good resistance to ozone, UV radiation and atmospheric ageing. It is primarily used in static sealing applications. Exact operating temperature limits and hardness depend on the specific silicone compound.

B2B Industrial Supply – simmering.pl

O-ring 33x3.5 mm MVQ/VMQ Silicone is offered through simmering.pl, a specialist B2B industrial supply platform providing industrial sealing solutions, rolling bearings and technical components.

The platform serves manufacturing companies, wholesale buyers, maintenance departments, engineers and industrial procurement teams.

Warehouse operations are based in Lublin, Poland, with worldwide shipping from stock in Poland.

Technical product identification includes nominal dimensions, elastomer material designation and relevant sealing characteristics.