O-Ring 45x4 mm VMQ/MVQ 70 Shore A - Silicone Rubber Sealing Ring

O-Ring 45x4 mm VMQ/MVQ 70 Shore A - Silicone Rubber Sealing Ring (Pack of 100)

O-Ring 45x4 mm VMQ/MVQ 70 Shore A is an industrial silicone rubber sealing ring with a nominal inside diameter of 45 mm, a cross-sectional diameter of 4 mm and a nominal outside diameter of 53 mm. Manufactured from VMQ/MVQ silicone elastomer with a nominal hardness of 70 Shore A, this O-ring is primarily intended for static sealing applications in industrial equipment, mechanical assemblies and correctly designed technical connections. The product is supplied in packs of 100 pieces, making it suitable for industrial maintenance, technical procurement and repeated assembly operations.

Technical Specifications - O-Ring 45x4 VMQ/MVQ 70 Shore A

The nominal outside diameter is calculated as follows:

53 mm = 45 mm + 2 x 4 mm

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

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

What Does O-Ring 45x4 VMQ/MVQ 70 Shore A Mean?

The product designation identifies its essential technical characteristics:

• 45 - nominal inside diameter of 45 mm.

• 4 - nominal cross-sectional diameter of 4 mm.

• VMQ - standardized designation for silicone rubber.

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

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

• 100 pcs - the sales package contains 100 individual O-rings.

The designation 45x4 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:

• Tensile strength.

• Tear resistance.

• Compression set.

• Chemical compatibility.

• Operating temperature limits.

• Aging resistance.

• Material approvals and certifications.

Matching dimensions, VMQ material designation and 70 Shore A hardness do not automatically guarantee complete interchangeability.

Construction and Operating Principle

The 45x4 mm VMQ/MVQ 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 4 mm Cross-Section at a 45 mm Inside Diameter

The 4 mm cross-sectional diameter is an important parameter affecting groove dimensions, sealing contact pressure and elastomer deformation under compression.

A 45x4 mm O-ring requires a correctly designed installation groove.

It should not automatically be replaced with a 45x3.5 mm or 45x5 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 70 Shore A - 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.

Hardness of 70 Shore A

A nominal hardness of 70 Shore A describes the elastomer's resistance to indentation.

Hardness influences:

• Deformation during installation.

• Sealing contact pressure.

• Force required for compression.

• Mechanical behavior under load.

• Resistance to extrusion into a clearance gap.

A hardness value of 70 Shore A does not independently determine maximum permissible operating pressure.

Pressure capability 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 45x4 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 45x4 mm and nominal hardness of 70 Shore A.

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 45x4 VMQ 70 Shore A

• O-Ring 45x4 MVQ 70 Shore A

• Silicone O-Ring 45x4 mm

• VMQ O-Ring 45x4 mm

• MVQ Silicone O-Ring 45x4

• O-Ring 45x4 70 ShA Silicone

• Silicone Rubber O-Ring 45x4 mm

• Silicone Sealing Ring 45x4 mm

• O-Ring 45 mm ID x 4 mm CS

• Silicone O-Ring 45x4 mm - 100 pcs

• Silicone Rubber O-Ring 45x4 mm - Pack of 100

• Industrial Silicone O-Ring 45x4 70 Shore A

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 45x4 mm Silicone O-Ring

Before ordering and installation, verify the following parameters:

• Inside diameter: 45 mm.

• Cross-sectional diameter: 4 mm.

• Nominal outside diameter: 53 mm.

• Material: VMQ / MVQ silicone rubber.

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

The groove depth should not simply be assumed to equal the 4 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 45x4 mm O-Ring Be Replaced with a 45x3.5 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 45x4 mm O-Ring Be Replaced with a 44x4 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.

Pack of 100 - Industrial Supply and Maintenance Applications

The product is supplied in a package containing 100 silicone O-rings measuring 45x4 mm with nominal hardness of 70 Shore A.

Bulk packaging is particularly useful for:

• Industrial maintenance departments.

• Mechanical workshops.

• Equipment repair services.

• Manufacturing facilities.

• Technical procurement departments.

• Companies assembling sealing kits.

• Businesses requiring repeated replacement of identical sealing components.

• Industrial spare parts distributors.

Each package contains 100 O-rings with the same nominal dimensional and material designation.

Purchasing O-rings in packs of 100 can simplify spare parts inventory planning, repair kit preparation and recurring maintenance operations.

Typical Applications of Silicone O-Rings 45x4 mm

Silicone O-rings with a 45 mm inside diameter and 4 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 70 Shore A 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 and 70 Shore A hardness do 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 45x4 VMQ/MVQ 70 Shore A

1. What are the dimensions of the 45x4 mm silicone O-ring?

The O-ring has a nominal inside diameter of 45 mm, cross-sectional diameter of 4 mm and outside diameter of 53 mm.

2. How many O-rings are included in one package?

Each sales package contains 100 silicone O-rings with nominal dimensions of 45x4 mm.

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 does 70 Shore A mean?

70 Shore A indicates the nominal hardness of the silicone elastomer. It influences deformation, contact pressure and sealing behavior.

5. Is the 45x4 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 45x4 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 45x4 mm O-ring interchangeable with a 45x3.5 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 45x4 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 45x4 mm O-ring?

The nominal outside diameter is 53 mm, calculated by adding twice the 4 mm cross-sectional diameter to the 45 mm inside diameter.

O-Ring 45x4 VMQ/MVQ 70 Shore A - Key Product Information

The 45x4 mm VMQ/MVQ 70 Shore A O-ring is a silicone rubber sealing ring with a 45 mm inside diameter, 4 mm circular cross-section and 53 mm nominal outside diameter. Its hardness is 70 Shore A. Supplied in packs of 100 pieces, it is primarily intended for compatible static sealing applications requiring correct groove design and material selection.

The 45x4 mm VMQ/MVQ 70 Shore A silicone O-ring, pack of 100, 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.