O-Ring 44x3.5 mm MVQ/VMQ - Silicone Rubber Sealing Ring

O-Ring 44x3.5 mm MVQ/VMQ - Silicone Rubber Sealing Ring

O-Ring 44x3.5 mm MVQ/VMQ is an industrial silicone rubber sealing ring with a nominal inside diameter of 44 mm, a cross-sectional diameter of 3.5 mm and a nominal outside diameter of 51 mm. Manufactured from VMQ/MVQ silicone elastomer, this O-ring is primarily intended for static sealing applications in industrial equipment, mechanical housings, covers and technical assemblies. Silicone O-rings are commonly used where suitable temperature-related properties and elastomer flexibility are required. Correct selection depends on material compatibility, operating conditions and groove geometry.

Technical Specifications - O-Ring 44x3.5 MVQ/VMQ

The nominal outside diameter is calculated as follows:

51 mm = 44 mm + 2 x 3.5 mm

This is the geometric outside diameter of the undeformed O-ring and does not include manufacturing tolerances.

Exact dimensional tolerances, hardness, operating temperature limits, chemical resistance and permissible operating conditions must be verified against the technical documentation for the specific silicone compound.

What Does O-Ring 44x3.5 MVQ/VMQ Mean?

The product designation identifies its essential technical characteristics:

• 44 - nominal inside diameter of 44 mm.

• 3.5 - nominal cross-sectional diameter of 3.5 mm.

• VMQ - standardized designation for silicone rubber.

• MVQ - alternative designation encountered in commercial silicone sealing terminology.

The designation 44x3.5 mm refers to the inside diameter and cross-sectional diameter, not the inside and outside diameters.

VMQ vs MVQ - Silicone Rubber Material Designations

VMQ is the standardized designation for silicone rubber used in industrial elastomeric sealing products.

MVQ is an alternative designation encountered in technical catalogs and commercial product descriptions.

Both terms refer to the silicone rubber material family but do not identify the complete compound formulation.

Different VMQ compounds may vary in:

• Hardness.

• Tensile strength.

• Tear resistance.

• Compression set.

• Chemical compatibility.

• Operating temperature limits.

• Aging resistance.

• Material approvals and certifications.

Matching dimensions and the VMQ material designation do not automatically guarantee complete interchangeability between O-rings manufactured from different silicone compounds.

Construction and Operating Principle

The 44x3.5 mm MVQ/VMQ silicone O-ring is a one-piece elastomeric sealing element with a circular cross-section.

It contains no metal reinforcement, spring or additional sealing lip.

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

The resulting elastic deformation generates contact pressure that helps prevent liquids or gases from passing through the sealing interface.

Effective sealing depends on:

• Correct groove geometry.

• Appropriate cross-sectional compression.

• Groove fill.

• Surface finish of mating components.

• Operating pressure.

• Temperature.

• Chemical compatibility.

• Compression set.

• Extrusion gap dimensions.

• Static or dynamic operating conditions.

Importance of the 3.5 mm Cross-Section at a 44 mm Inside Diameter

The 3.5 mm cross-sectional diameter is an important parameter affecting the required groove dimensions, sealing contact pressure and elastomer deformation under compression.

A 44x3.5 mm O-ring requires a correctly designed installation groove.

It should not automatically be replaced with a 44x3 mm or 44x4 mm O-ring.

Changing the cross-sectional diameter affects elastomer volume, compression and groove fill.

Incorrect selection may result in leakage, seal damage or excessive loading of mating components.

Silicone Rubber VMQ - Material Properties

Flexibility Across a Broad Temperature Range

VMQ silicone rubber is commonly used in sealing applications requiring flexibility at low temperatures and resistance to elevated temperatures.

Compared with many conventional elastomers, silicone rubber can offer favorable temperature-related properties.

However, the exact permissible operating temperature range depends on:

• Silicone compound formulation.

• Duration of temperature exposure.

• Sealed medium.

• Mechanical loading.

• Compression level.

• Environmental conditions.

Specific minimum and maximum operating temperatures should not be assigned without verified material documentation.

Silicone Hardness and Sealing Performance

Elastomer hardness influences its deformation during installation and behavior under mechanical loading.

This parameter affects:

• Sealing contact pressure.

• Force required for compression.

• Elastomer deformation inside the groove.

• Resistance to extrusion into a clearance gap.

• Sealing performance under specific operating conditions.

Hardness alone does not determine maximum permissible operating pressure.

Pressure capability also depends on groove geometry, extrusion gap, temperature and the mechanical properties of the specific silicone compound.

Chemical Compatibility

VMQ silicone rubber is not universally resistant to all chemicals.

Before installation, compatibility should be checked for:

• Mineral oils.

• Fuels.

• Solvents.

• Cleaning agents.

• Industrial process fluids.

• Gases.

• Chemical substances.

Chemical resistance also depends on temperature, concentration and exposure duration.

Particular care is required when selecting silicone O-rings for contact with oils, fuels and solvents. Compatibility should not be assumed without verification.

Aging and Environmental Resistance

VMQ silicone rubber is used in applications where resistance to aging and the ability to maintain flexibility under changing temperature conditions are important.

However, the performance of the finished O-ring depends on the specific compound formulation, operating environment and service duration.

Suitability for prolonged environmental exposure should be confirmed using the relevant material specifications.

Mechanical Resistance

Silicone rubber may exhibit lower resistance to tearing and abrasion than elastomers specifically selected for intensive dynamic sealing.

During installation of the 44x3.5 mm silicone O-ring, avoid:

• Excessive stretching.

• Twisting of the cross-section.

• Contact with sharp edges.

• Pinching between mating components.

• Incompatible assembly lubricants.

VMQ vs NBR, FKM and EPDM O-Rings

These materials may all be available as O-rings with identical dimensions of 44x3.5 mm.

However, they are not automatically interchangeable.

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

Alternative Designations and Search References

The product may appear under the following commercial designations:

• O-Ring 44x3.5 MVQ

• O-Ring 44x3.5 VMQ

• Silicone O-Ring 44x3.5 mm

• VMQ O-Ring 44x3.5 mm

• MVQ Silicone O-Ring 44x3.5

• Silicone Rubber O-Ring 44x3.5 mm

• Silicone Sealing Ring 44x3.5 mm

• Industrial Silicone O-Ring 44x3.5

• O-Ring 44 mm ID x 3.5 mm CS

• Silicone Rubber Seal 44x3.5 mm

• Circular Silicone Sealing Ring 44x3.5 mm

• Metric Silicone O-Ring 44x3.5 mm

These are alternative commercial descriptions of the same nominal dimensions and material category.

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

Selecting the Correct 44x3.5 mm Silicone O-Ring

Before ordering and installation, verify the following parameters:

• Inside diameter: 44 mm.

• Cross-sectional diameter: 3.5 mm.

• Nominal outside diameter: 51 mm.

• Material: VMQ / MVQ silicone rubber.

• Hardness appropriate for the application.

• 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 sufficient compression to create an effective seal while allowing space for elastomer deformation.

The groove depth should not simply be assumed to equal the 3.5 mm cross-sectional diameter.

Insufficient compression may cause leakage, while excessive compression may damage the elastomer or accelerate permanent deformation.

Groove dimensions should be selected according to the sealing arrangement and applicable engineering design guidelines.

Can a 44x3.5 mm O-Ring Be Replaced with a 44x3 mm O-Ring?

Not automatically.

The difference in cross-sectional diameter is 0.5 mm.

This may significantly affect compression, groove fill and correct installation.

Interchangeability requires verification of the groove geometry and operating conditions.

Can a 44x3.5 mm O-Ring Be Replaced with a 45x3.5 mm O-Ring?

Not automatically.

The difference in nominal inside diameter is 1 mm.

This may affect installation stretch, groove fit and sealing contact pressure.

Interchangeability requires verification of dimensions and tolerances.

Can a VMQ O-Ring Be Replaced with NBR?

Not always.

VMQ and NBR differ in chemical, thermal and mechanical properties.

Changing the material requires verification of compatibility with the sealed medium and operating conditions.

Typical Applications of Silicone O-Rings 44x3.5 mm

Silicone O-rings with a 44 mm inside diameter and 3.5 mm cross-section may be used in correctly designed sealing arrangements where the material and geometry are compatible with operating conditions.

Potential applications include:

• Static joints in industrial equipment.

• Mechanical covers and housings.

• Technical and industrial assemblies.

• Connections requiring elastomeric sealing rings.

• Mechanical components with correctly designed O-ring grooves.

• Static sealing arrangements involving compatible liquids or gases.

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

Dynamic Sealing Applications

Silicone O-rings may be used in certain dynamic sealing arrangements, but these applications require appropriate engineering design.

Important considerations include:

• Movement speed.

• Friction.

• Lubrication.

• Sealing contact pressure.

• Operating temperature.

• Wear resistance.

• Expected service life.

Due to the mechanical characteristics of silicone rubber, not every VMQ O-ring is suitable for intensive dynamic sealing.

Food, Medical and Drinking Water Applications

Silicone rubber is used in certain food-contact, medical and drinking-water applications.

However, the VMQ material designation alone does not establish regulatory compliance.

Suitability for these applications requires appropriate documentation for the specific silicone compound and finished product.

The VMQ designation does not independently confirm FDA compliance or any other food-contact approval.

Installation and Maintenance

Preparing the Sealing Surfaces

Before installation, clean the groove and mating surfaces.

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

Inspect the groove for scratches, corrosion and dimensional defects.

Installing the O-Ring

During installation:

• Position the O-ring evenly inside the groove.

• Avoid twisting the elastomer.

• Do not stretch the ring more than necessary.

• Avoid sharp installation tools.

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

• Check that the O-ring is not trapped or pinched between mating components.

• Inspect the entire circumference for correct positioning.

Inspection During Service

During scheduled maintenance, inspect the O-ring for:

• Cracking and tearing.

• Permanent cross-sectional flattening.

• Excessive swelling.

• Loss of elasticity.

• Abrasion.

• Mechanical damage.

Replace the O-ring if deterioration or damage is detected.

Storage

Store silicone O-rings in a clean, dry environment without permanent compression or excessive stretching.

Protect them from contamination, mechanical damage and unsuitable storage conditions.

Frequently Asked Questions - O-Ring 44x3.5 MVQ/VMQ

1. What are the dimensions of the 44x3.5 mm silicone O-ring?

The O-ring has a nominal inside diameter of 44 mm, cross-sectional diameter of 3.5 mm and outside diameter of 51 mm.

2. What material is the 44x3.5 mm MVQ O-ring made from?

The sealing ring is manufactured from silicone rubber, designated VMQ or MVQ.

3. What does VMQ or MVQ mean?

VMQ is the standardized designation for silicone rubber. MVQ is an alternative designation encountered in industrial sealing terminology.

4. What is the hardness of the 44x3.5 mm silicone O-ring?

The hardness must be confirmed in the specification for the specific product. The VMQ material designation alone does not identify a Shore A hardness value.

5. Is the 44x3.5 mm silicone O-ring resistant to high temperatures?

VMQ silicone rubber is commonly used in applications requiring flexibility across a broad temperature range. Exact operating temperature limits depend on the specific compound.

6. Can a 44x3.5 mm VMQ O-ring replace an NBR O-ring?

Not automatically. VMQ and NBR differ in chemical, thermal and mechanical properties. Material compatibility must be verified before substitution.

7. Is a 44x3.5 mm O-ring interchangeable with a 44x4 mm O-ring?

Not automatically. The cross-sectional difference is 0.5 mm. Groove geometry, dimensional tolerances and required compression must be checked.

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

Not without appropriate documentation. Food-contact suitability requires verification of the specific silicone compound and finished product.

9. Can a 44x3.5 mm silicone O-ring be used with oil?

Compatibility depends on the type of oil, its additives, operating temperature and the specific VMQ compound. Resistance to all oils should not be assumed.

10. What is the outside diameter of a 44x3.5 mm O-ring?

The nominal outside diameter is 51 mm, calculated by adding twice the 3.5 mm cross-sectional diameter to the 44 mm inside diameter.

O-Ring 44x3.5 MVQ/VMQ - Key Product Information

The 44x3.5 mm MVQ/VMQ O-ring is a silicone rubber sealing ring with a 44 mm inside diameter, 3.5 mm circular cross-section and 51 mm nominal outside diameter. It is primarily intended for compatible static sealing applications requiring correct groove design and material selection. Before installation, the required hardness, chemical compatibility, temperature, pressure and groove geometry must be verified.

The 44x3.5 mm MVQ/VMQ 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 Poland and other European Union countries.