O-ring 120x3.5 mm MVQ/VMQ - Silicone Rubber O-ring

Technical Specifications

The Shore A hardness, colour, dimensional tolerances, exact silicone compound and permissible operating temperature range are not defined by the product designation. These properties require confirmation for the supplied product.

What Does O-ring 120x3.5 MVQ/VMQ Mean?

The designation identifies the nominal dimensions and material family of the sealing ring.

• 120 mm - nominal inside diameter.

• 3.5 mm - nominal cross-sectional diameter.

• MVQ/VMQ - designations referring to silicone rubber used in elastomeric sealing applications.

The nominal outside diameter is calculated as:

120 + (2 x 3.5) = 127 mm.

The calculated value of 127 mm is a geometric nominal dimension, not a separately verified measurement of the finished product.

MVQ and VMQ refer to the same general silicone rubber family. They do not indicate two material layers or a double-sealing construction.

Construction and Sealing Principle

The O-ring 120x3.5 mm MVQ/VMQ is a continuous silicone rubber ring with a circular cross-section.

When positioned in a properly designed sealing groove and compressed between mating surfaces, the elastomer undergoes elastic deformation. This creates contact pressure that helps prevent leakage through the sealed joint.

Sealing performance depends on groove geometry, compression, dimensional tolerances, surface finish, operating pressure and the properties of the silicone compound.

The 3.5 mm cross-sectional diameter is an essential selection parameter. It must not be replaced with a different cross-section solely because the inside diameter remains 120 mm.

Properties of MVQ/VMQ Silicone Rubber

Silicone rubber is valued for its flexibility and resistance to ozone, atmospheric ageing and various environmental influences.

Relevant material characteristics include:

• Flexibility across a broad temperature range, depending on the compound.

• Resistance to ozone and atmospheric ageing.

• Suitability for appropriately designed static sealing arrangements.

• Lower tear and abrasion resistance than certain other elastomer compounds.

• Chemical resistance that depends on the specific formulation and sealed medium.

The VMQ designation alone does not establish an exact maximum operating temperature, Shore A hardness or chemical resistance rating.

Silicone rubber is not universally compatible with mineral oils, fuels, solvents or industrial chemicals. Compatibility must be assessed for the specific compound and operating conditions.

O-ring MVQ/VMQ Compared with NBR, EPDM and FKM

MVQ/VMQ is not FKM/FPM or Viton.

Viton is a trademark associated with certain fluoroelastomers, whereas MVQ/VMQ identifies the silicone rubber family.

O-rings manufactured from different elastomers are not automatically interchangeable, even when their nominal dimensions are identical.

Alternative Designations and Search References

The same nominal dimensions and material family may appear under alternative technical or commercial descriptions:

• O-ring 120x3.5 MVQ

• O-ring 120x3.5 VMQ

• Silicone O-ring 120x3.5 mm

• Silicone rubber sealing ring 120x3.5 mm

• MVQ/VMQ O-ring 120x3.5

• O-ring ID 120 mm CS 3.5 mm

These are descriptive variations, not verified manufacturer part numbers or confirmed OEM cross-references.

Identical nominal dimensions and material-family designations do not guarantee identical compound properties.

Selection and Interchangeability

Before selecting the O-ring 120x3.5 mm MVQ/VMQ, verify the following:

• Nominal inside diameter and cross-sectional diameter.

• Sealing groove dimensions and tolerances.

• Required elastomer compression.

• Shore A hardness of the actual silicone compound.

• Operating temperature and pressure.

• Chemical compatibility with the sealed medium.

• Static or dynamic operating conditions.

• Risk of abrasion, tearing and extrusion into clearance gaps.

An NBR, EPDM or FKM O-ring with the same dimensions may have significantly different operating characteristics.

Changing the elastomer material requires an assessment of the intended sealing application.

Typical Applications

Silicone rubber O-rings of this size may be considered for appropriately designed static sealing joints, including covers, housings, flanges and other stationary assemblies.

These are general application categories for silicone O-rings, not verified OEM applications for this specific product.

Suitability depends on the groove design, mechanical conditions and compatibility of the silicone compound with the operating environment.

Installation and Handling

Before installation, clean the sealing groove and mating surfaces. Remove burrs and protect sharp edges that could cut or damage the elastomer.

Position the O-ring evenly in the groove, avoiding twisting, excessive stretching and localised deformation.

If an assembly lubricant is used, verify compatibility with the specific silicone compound.

Store the O-ring in clean conditions, protected from contamination, mechanical damage and unnecessary deformation.

FAQ - Frequently Asked Questions

1. What are the dimensions of the O-ring 120x3.5 MVQ/VMQ?

The nominal inside diameter is 120 mm, and the cross-sectional diameter is 3.5 mm. The calculated nominal outside diameter is 127 mm.

2. What does MVQ/VMQ mean in the O-ring designation?

MVQ and VMQ refer to the silicone rubber material family. The designation does not define the exact compound formulation or hardness.

3. Is the MVQ/VMQ O-ring made from Viton?

No. MVQ/VMQ identifies silicone rubber, while Viton is a trademark associated with certain FKM fluoroelastomers.

4. What is the hardness of the silicone O-ring 120x3.5 mm?

The Shore A hardness is not specified in the product designation. It must be confirmed using the technical documentation for the supplied product.

5. Is the silicone O-ring 120x3.5 mm suitable for high temperatures?

Silicone rubber compounds can be suitable for elevated-temperature applications. However, the permissible temperature range depends on the compound, exposure duration and sealed medium. No exact temperature limit can be assigned without compound-specific documentation.

6. Can an NBR O-ring 120x3.5 mm be replaced with an MVQ/VMQ O-ring?

Not without checking the operating conditions. The materials differ in chemical compatibility, mechanical strength and temperature-dependent behaviour.

7. Is the O-ring 120x3.5 MVQ/VMQ suitable for dynamic sealing?

Dynamic sealing requires separate technical evaluation. Silicone rubber may have limited abrasion and tear resistance, so suitability for moving components must not be assumed.

8. What should be checked before installing this O-ring?

Verify groove dimensions, compression, surface condition, material compatibility and the absence of sharp edges. The O-ring must be installed without twisting or excessive stretching.

O-ring 120x3.5 MVQ/VMQ - Key Information

The O-ring 120x3.5 mm MVQ/VMQ is a silicone rubber sealing ring with a nominal inside diameter of 120 mm and a cross-sectional diameter of 3.5 mm. Its calculated nominal outside diameter is 127 mm. The material offers flexibility and resistance to atmospheric ageing. Proper selection requires verification of compound hardness, operating temperature, pressure and chemical compatibility.

The product can be sourced through the specialist B2B industrial trading platform simmering.pl, supporting industrial procurement and worldwide shipping from stock in Poland, subject to product availability.