O-Ring 64x4 VMQ 70 ShA Silicone

O-Ring 64x4 VMQ 70 ShA Silicone

O-Ring 64x4 VMQ 70 ShA is a silicone sealing ring with a 64 mm inside diameter and 4 mm cross-section, manufactured from VMQ silicone rubber with a nominal hardness of 70 Shore A. The calculated outside diameter is 72 mm. The O-ring has a round cross-section and is designed for installation in an appropriately dimensioned sealing groove.

Technical data - O-Ring 64x4 VMQ 70 ShA

The exact operating temperature range, resistance to specific media and any regulatory approvals depend on the specific VMQ compound. Without technical documentation for the exact compound, unverified parameters should not be assigned to this product.

O-Ring 64x4 mm dimensions

The designation:

64x4 mm

defines the two fundamental O-ring dimensions:

• 64 mm - inside diameter d1
• 4 mm - cross-section diameter d2

The calculated outside diameter is:

64 mm + 2 x 4 mm = 72 mm

Both the inside diameter and cross-section must be considered when identifying an O-ring.

The description "64 mm O-ring" alone is insufficient because O-rings with a 64 mm inside diameter can be manufactured with different cross-sections.

What does O-Ring 64x4 VMQ 70 ShA mean?

The complete designation identifies the key product characteristics:

64 - nominal inside diameter of 64 mm.

4 - nominal cross-section diameter of 4 mm.

VMQ - silicone rubber.

70 ShA - nominal elastomer hardness of 70 Shore A.

The complete technical identification is therefore:

O-Ring 64x4 mm VMQ 70 ShA

VMQ or MVQ?

The recommended technical designation for this silicone rubber family is:

VMQ

Therefore, the recommended international product name is:

O-Ring 64x4 VMQ 70 ShA Silicone

The spelling:

MVQ

may occur in commercial descriptions and customer searches and can therefore be included naturally as an alternative search variant.

For the product name, H1 and technical specification, VMQ is the recommended designation.

VMQ silicone rubber

VMQ belongs to the silicone rubber family of elastomers used for O-rings and other sealing components.

Characteristic properties associated with the VMQ material family include:

• useful elastomeric properties across a broad temperature range
• very good low-temperature flexibility
• good resistance to ozone
• good resistance to UV radiation
• good resistance to weathering
• useful electrical insulation properties

These are general characteristics of the VMQ material family. Exact numerical performance values depend on the formulation of the specific silicone compound.

Operating temperature of VMQ 70 ShA

A single universal operating temperature range should not automatically be assigned to every VMQ 70 ShA O-ring.

Actual temperature limits depend on factors including:

• exact VMQ compound formulation
• operating medium
• exposure duration
• pressure
• sealing-system design
• static or dynamic operation
• other application conditions

For this reason, no unverified minimum or maximum operating temperature is stated for this specific O-Ring 64x4 VMQ 70 ShA.

Where temperature is a critical parameter, the technical data sheet for the exact VMQ compound should be verified.

What does 70 ShA mean?

70 ShA indicates a nominal elastomer hardness of 70 on the Shore A scale.

Hardness influences how the O-ring deforms when compressed inside the sealing groove.

However, hardness alone does not determine:

• operating temperature
• chemical resistance
• oil compatibility
• fuel compatibility
• abrasion resistance
• sealing service life
• food-contact approval

O-rings manufactured from different elastomers may have the same nominal hardness of 70 ShA while exhibiting significantly different material properties.

Construction and operating principle

O-Ring 64x4 VMQ is a closed elastomeric sealing ring with a circular cross-section of 4 mm.

When installed in a correctly designed sealing groove and compressed between mating components, the O-ring deforms elastically.

This deformation generates contact pressure against the mating surfaces and creates a sealing barrier.

Effective sealing depends on the complete sealing system, including:

• O-ring dimensions
• groove geometry
• compression
• O-ring stretch
• mating surface condition
• operating medium
• temperature
• pressure
• static or dynamic operating conditions

The 64x4 mm dimensions alone are therefore not sufficient to determine whether the O-ring is suitable for a particular application.

O-Ring 64x4 VMQ vs NBR

O-Ring 64x4 VMQ 70 ShA and O-Ring 64x4 NBR 70 ShA may have identical dimensions and nominal hardness, but they are not materially equivalent.

VMQ is silicone rubber.

NBR is nitrile rubber.

These material families have different thermal, chemical and mechanical characteristics.

Therefore, dimensional compatibility at 64x4 mm does not automatically mean complete interchangeability.

O-Ring 64x4 VMQ vs FKM

The same principle applies when comparing VMQ with FKM.

An O-Ring 64x4 VMQ and O-Ring 64x4 FKM may fit the same sealing groove dimensionally, but their material characteristics can differ significantly.

Before changing the elastomer material, verify:

• operating medium
• temperature
• pressure
• type of movement
• environmental conditions
• specific application requirements

O-ring material should not be selected on dimensions alone.

Chemical compatibility of VMQ

VMQ should not be regarded as universally resistant to all chemicals.

Material compatibility should be checked particularly when the O-ring is exposed to:

• oils
• fuels
• greases
• solvents
• acids
• alkalis
• alcohols
• water and steam
• gases
• industrial process fluids

Where chemical resistance is critical, compatibility data for the exact VMQ compound and operating medium should be verified.

Is a VMQ silicone O-ring food safe?

The VMQ designation alone does not confirm food-contact approval.

Special silicone compounds are available with specific approvals for food, pharmaceutical and medical applications. However, certification applies to a specific compound or finished product.

Without supporting documentation, O-Ring 64x4 VMQ 70 ShA should not automatically be described as compliant with FDA, EC 1935/2004 or medical requirements.

O-Ring 64x4 vs O-Ring 64x5

O-Ring 64x4 mm is not the same size as O-Ring 64x5 mm.

Both rings have a 64 mm inside diameter, but their cross-sections differ.

O-Ring 64x4 mm:

• inside diameter 64 mm
• cross-section 4 mm
• calculated outside diameter 72 mm

O-Ring 64x5 mm:

• inside diameter 64 mm
• cross-section 5 mm
• calculated outside diameter 74 mm

The difference in cross-section affects groove filling, sealing compression and operating conditions.

These sizes should not be considered automatically interchangeable.

Selection and interchangeability

Before purchasing O-Ring 64x4 VMQ 70 ShA, verify:

• inside diameter 64 mm
• cross-section 4 mm
• material VMQ
• nominal hardness 70 ShA
• groove geometry
• required compression
• permissible stretch
• operating medium
• temperature
• pressure
• static or dynamic operating conditions

Identical dimensions do not automatically mean complete interchangeability.

O-rings measuring 64x4 mm manufactured from VMQ, NBR, FKM or EPDM may have identical geometry but different material properties.

Applications

O-Ring 64x4 VMQ can be used as a sealing element in appropriately designed grooves where the properties of the specific silicone compound meet the application requirements.

O-rings as a sealing type can be used in static applications and, with appropriate sealing-system design, in selected dynamic applications.

No specific machine, vehicle, engine, gearbox or OEM application is assigned to this SKU without supporting technical documentation.

Installation and handling

Before installation, inspect the O-ring, sealing groove and mating surfaces.

The surfaces should be clean and free from:

• contamination
• metal particles
• sharp edges
• burrs
• damage that could cut or scratch the elastomer

Do not twist or excessively stretch the O-ring during installation.

Avoid sharp tools that could damage the elastomer surface.

If an assembly lubricant is required, its compatibility with the VMQ material and operating medium should be verified beforehand.

O-rings should be stored away from excessive heat, direct UV exposure, contamination and conditions that could damage the elastomer.

Alternative designations and search references

Natural product references include:

O-Ring 64x4 VMQ 70 ShA

64x4 VMQ O-Ring

O-Ring 64x4 MVQ 70 ShA

64x4 MVQ O-Ring

Silicone O-Ring 64x4 mm

64x4 silicone O-ring

64 mm ID 4 mm CS O-ring

VMQ 70 Shore O-Ring 64x4

Silicone sealing ring 64x4 mm

64x4 silicone rubber O-ring

No OEM or cross-reference numbers are stated because none have been confirmed for this product.

FAQ

What are the dimensions of O-Ring 64x4 VMQ 70 ShA?

The inside diameter is 64 mm and the cross-section is 4 mm. The calculated outside diameter is 72 mm.

What does VMQ mean?

VMQ identifies a family of silicone rubber elastomers used for O-rings and other sealing components.

What does 70 ShA mean?

70 ShA indicates a nominal elastomer hardness of 70 on the Shore A scale.

VMQ or MVQ - which designation is correct?

VMQ is the recommended technical designation for this silicone rubber family. MVQ may occur as an alternative search spelling, but VMQ should be used in the technical specification.

What is the operating temperature of O-Ring 64x4 VMQ 70 ShA?

The exact operating temperature range cannot be confirmed from the VMQ 70 ShA designation alone. It depends on the specific compound, operating medium and application conditions.

Can O-Ring 64x4 VMQ replace O-Ring 64x4 NBR?

Not automatically. The dimensions may be identical, but VMQ and NBR have different material characteristics. The operating medium, temperature and other application conditions must be checked.

Can O-Ring 64x4 be replaced with O-Ring 64x5?

Not without checking the sealing groove. O-Ring 64x5 has a larger cross-section and a calculated outside diameter of 74 mm instead of 72 mm.

Is O-Ring 64x4 VMQ approved for food contact?

This cannot be confirmed from the VMQ designation alone. Food-contact approval must be supported by documentation for the exact compound or finished product.

O-Ring 64x4 VMQ 70 ShA - key information

O-Ring 64x4 VMQ 70 ShA is a silicone sealing ring with a 64 mm inside diameter and 4 mm cross-section. Its calculated outside diameter is 72 mm. VMQ identifies silicone rubber, while 70 ShA specifies the nominal Shore A hardness. Material compatibility should be verified against the operating medium, temperature and application conditions.