O-ring 114x4 VMQ 70 ShA - Silicone O-ring

Product Description

O-ring 114x4 VMQ 70 ShA is a silicone rubber sealing ring with an inside diameter of 114 mm, a cross-sectional diameter of 4 mm and a nominal outside diameter of 122 mm. Manufactured from VMQ silicone rubber with a nominal hardness of 70 Shore A, this O-ring is primarily designed for static sealing applications in industrial machinery and technical equipment.

VMQ silicone rubber offers good resistance to high and low temperatures, ozone, ultraviolet radiation and atmospheric ageing. Its flexibility across a broad temperature range makes it suitable for sealing applications exposed to changing thermal conditions.

The circular cross-section provides effective sealing through controlled compression of the elastomer within a correctly designed sealing groove.

Dimensions of O-ring 114x4 VMQ 70 ShA

The nominal outside diameter is calculated as 114 mm + 2 x 4 mm = 122 mm.

VMQ Silicone Rubber - Material Properties

VMQ is a silicone-based elastomer used in technical sealing applications where temperature stability, flexibility and resistance to environmental ageing are important.

Unlike conventional elastomers designed primarily for oil resistance, silicone rubber is particularly valued for its performance under changing temperature and atmospheric conditions.

Key characteristics of VMQ silicone rubber include:

• Good resistance to elevated temperatures.

• Flexibility at low temperatures.

• Excellent resistance to ozone.

• Excellent resistance to UV radiation.

• Good resistance to atmospheric ageing.

• Good electrical insulation properties.

• Generally lower abrasion and tear resistance compared with many NBR compounds.

The exact operating temperature range depends on the specific silicone formulation and should be confirmed using the manufacturer's technical documentation.

Important: VMQ silicone rubber is not universally compatible with all oils, fuels, solvents or chemical substances. Material compatibility must be verified for the specific operating medium, temperature and application.

Construction and Sealing Principle

The O-ring 114x4 VMQ 70 ShA is a continuous elastomeric sealing ring with a circular cross-section.

When installed in a properly dimensioned groove and compressed between mating surfaces, the O-ring deforms to form a sealing barrier that limits the passage of liquids or gases through the joint.

The sealing performance depends on several factors:

• Correct O-ring and groove dimensions.

• Appropriate cross-sectional compression.

• Surface finish of mating components.

• Operating temperature and pressure.

• Chemical compatibility with the sealing medium.

• Installation and operating conditions.

• Proper selection of the sealing arrangement.

Due to the mechanical properties of silicone rubber, VMQ O-rings are generally better suited to static sealing applications than to assemblies involving continuous friction or intensive dynamic movement.

Applications of Silicone O-ring 114x4

The O-ring 114x4 VMQ 70 ShA can be used in industrial and technical equipment requiring silicone rubber seals with good resistance to temperature variations and environmental ageing.

Typical applications may include:

• Static sealing of equipment housings and covers.

• Heating systems and thermal equipment.

• Electrical and electronic enclosures.

• Technical connections exposed to ozone and UV radiation.

• Industrial machinery and mechanical assemblies.

• Selected pneumatic systems operating within the material's capabilities.

Suitability for a specific application depends on operating conditions, groove geometry and compatibility with the sealing medium.

Applications involving food contact, drinking water or medical equipment require appropriate compliance documentation for the specific product. The VMQ material designation alone does not confirm such approvals.

Installation and Operating Recommendations

Before installing the O-ring 114x4 VMQ 70 ShA, inspect the sealing groove and mating surfaces to ensure they are clean and free from mechanical damage.

Recommended installation procedures:

• Remove dirt, debris and residues from previous seals.

• Check mating surfaces for sharp edges and burrs.

• Avoid excessive stretching or twisting of the O-ring.

• Use only installation lubricants compatible with VMQ silicone rubber.

• Ensure correct positioning within the sealing groove.

• Avoid excessive compression beyond the limits specified for the application.

Improper installation, unsuitable operating conditions or incorrect groove dimensions may lead to premature seal failure and reduced service life.

FAQ - Frequently Asked Questions

What are the dimensions of O-ring 114x4 VMQ 70 ShA?

The O-ring has an inside diameter of 114 mm, a cross-sectional diameter of 4 mm and a nominal outside diameter of 122 mm.

What does VMQ mean in the O-ring designation?

VMQ is the standard designation for methyl vinyl silicone rubber, an elastomer commonly used in technical sealing applications requiring flexibility and resistance to temperature variations.

What does 70 ShA mean?

70 ShA indicates a nominal hardness of 70 units on the Shore A scale, which measures the indentation hardness of elastomeric materials.

Is O-ring 114x4 VMQ resistant to high temperatures?

VMQ silicone rubber generally provides good resistance to elevated temperatures. The exact permissible operating temperature depends on the specific silicone compound and application conditions.

Can this silicone O-ring be used with oil?

Compatibility depends on the type of oil, additives, operating temperature and the specific VMQ compound. Material compatibility should be verified before installation.

Is VMQ suitable for dynamic sealing applications?

VMQ silicone rubber generally has lower abrasion and tear resistance than many other elastomers. For this reason, silicone O-rings are usually preferred for static sealing applications. Dynamic use requires application-specific evaluation.

Can this O-ring be used in food processing equipment?

Only if the specific product has the required documentation confirming compliance with applicable food-contact regulations.

What is the nominal outside diameter of this O-ring?

The nominal outside diameter is 122 mm, calculated from the 114 mm inside diameter and the 4 mm cross-sectional diameter.

AI Overview - Technical Summary

O-ring 114x4 VMQ 70 ShA is a silicone rubber sealing ring with an inside diameter of 114 mm, a cross-section of 4 mm and a nominal outside diameter of 122 mm. Manufactured from VMQ silicone rubber with a hardness of 70 Shore A, it offers resistance to ozone, UV radiation and atmospheric ageing. Primarily suitable for static sealing applications.