Silicone (VMQ) O-Rings
Silicone (VMQ) O-rings are highly versatile sealing solutions known for their excellent flexibility, wide operating temperature range and outstanding resistance to weathering and environmental ageing. Their ability to maintain performance in both extremely low and elevated temperatures makes them a popular choice across food processing, medical, pharmaceutical, electronics and general industrial applications.
We supply a comprehensive range of Silicone O-rings and sealing products to manufacturers, maintenance engineers and OEMs throughout the UK. Whether you require seals for temperature-sensitive applications, outdoor equipment or specialist industrial systems, Silicone O-rings provide dependable sealing performance and long service life.
What is Silicone (VMQ)?
VMQ is the industry designation for Silicone rubber, a synthetic elastomer known for its flexibility and thermal stability. Silicone excels in applications where temperature extremes, weather resistance and material purity are key considerations.
Silicone O-rings create an effective seal between mating surfaces, helping to prevent fluid or gas leakage while maintaining reliable performance across a broad range of operating conditions.
Benefits of Silicone O-Rings
- Excellent high and low temperature resistance
- Outstanding flexibility and elasticity
- Superior resistance to UV, ozone and weathering
- Good electrical insulating properties
- Available in food-grade and medical-grade compounds
- Excellent colour stability
- Long service life in outdoor environments
- Available in a variety of colours and grades
Typical Industries and Applications
Silicone O-rings are commonly used in:
- Food and beverage processing
- Medical and healthcare equipment
- Pharmaceutical manufacturing
- Electronics and electrical systems
- Lighting equipment
- Outdoor installations
- Aerospace applications
- General industrial machinery
Temperature Performance
Standard Silicone compounds typically operate between:
-60°C to +200°C
Specialist grades may offer enhanced performance beyond these limits depending on the application.
Chemical Compatibility
Silicone performs well when exposed to:
- Air and oxygen
- Ozone
- UV light
- Weathering
- Water
- Certain dilute chemicals
However, Silicone is generally not recommended for prolonged exposure to:
- Mineral oils
- Petroleum-based fuels
- Concentrated acids
- Many solvents and hydrocarbons
For applications involving oils and fuels, NBR or FKM may be more suitable alternatives.
Silicone vs Other O-Ring Materials
Choose Silicone O-Rings When:
- Extreme temperatures are present
- Flexibility at low temperatures is required
- Outdoor weather resistance is important
- Food-grade or medical-grade materials are needed
- Electrical insulation properties are beneficial
Choose NBR O-Rings When:
- Oil and fuel resistance is required
- Hydraulic systems are involved
- Cost is a primary consideration
Choose FKM O-Rings When:
- Exposure to aggressive chemicals is expected
- High-temperature fuel applications are involved
- Enhanced chemical resistance is required
Frequently Asked Questions
What is a Silicone (VMQ) O-ring?
A Silicone O-ring is a sealing component manufactured from VMQ (Silicone rubber), offering excellent flexibility, weather resistance and temperature performance.
What temperature range can Silicone O-rings withstand?
Standard Silicone O-rings typically operate between -60°C and +200°C, making them suitable for both extremely cold and elevated-temperature applications.
What are Silicone O-rings commonly used for?
Silicone O-rings are widely used in food processing, medical equipment, pharmaceutical manufacturing, electronics and outdoor applications.
Are Silicone O-rings suitable for outdoor use?
Yes. Silicone offers excellent resistance to UV light, ozone and weathering, making it well suited to outdoor environments.
Are Silicone O-rings resistant to oils and fuels?
Silicone has limited resistance to petroleum-based oils and fuels. For these applications, NBR or FKM O-rings are usually recommended.
What is the difference between Silicone and EPDM O-rings?
Both materials offer good weather resistance, but Silicone generally provides a wider operating temperature range and is commonly used in food-grade, medical and electronic applications.
