Silicone Rubber Cord: Properties, Applications, and Benefits

Choosing the right O-ring material is essential for ensuring reliable sealing performance under different temperatures, pressures, chemicals, and operating environments. The wrong choice can lead to leaks, equipment failure, and costly downtime.

NBR O-rings, Viton O-rings, EPDM O-rings, and silicone rubber cord each offer unique benefits for specific applications. Understanding their differences helps you select the best sealing material for your industry and operating conditions.

This guide compares the properties, applications, strengths, and limitations of each material to help you make an informed decision.

Why O-Ring Material Selection Matters

An O-ring creates a leak-proof seal between two mating surfaces, but its performance depends on the operating environment. Factors such as temperature, pressure, chemicals, fluids, and weather can significantly affect sealing efficiency.

Applications involving hydraulic fluids, steam, water, UV exposure, food contact, or outdoor conditions require specific materials. Choosing the right O-ring material ensures long-lasting performance, reliability, and reduced maintenance.

What Are NBR O-Rings?

NBR O-rings, also known as Nitrile or Buna-N O-rings, are among the most commonly used sealing materials worldwide because of their excellent resistance to petroleum-based oils and fuels.

They provide outstanding mechanical strength while remaining one of the most cost-effective sealing options available. If you’re sourcing premium sealing products for industrial maintenance or OEM applications, choosing a trusted rubber O ring supplier UAE ensures access to high-quality O-rings in multiple materials, sizes, and specifications for reliable long-term performance.

Advantages of NBR O-Rings

• Excellent resistance to mineral oils
• High wear resistance
• Good tensile strength
• Suitable for hydraulic systems
• Affordable for industrial applications
• Wide availability in standard and metric sizes

Limitations

NBR is not recommended for:

• Strong ozone exposure
• Outdoor weathering
• Hot water for extended periods
• Brake fluids
• Ketones

Common Applications

• Hydraulic cylinders
• Pneumatic systems
• Fuel systems
• Automotive engines
• Industrial pumps
• Compressors

Operating Temperature:

-30°C to +120°C

What Are Viton O-Rings?

Viton O-rings, manufactured from fluorocarbon rubber (FKM), are designed for harsh industrial environments where high temperatures and aggressive chemicals are common.

They are widely preferred in aerospace, petrochemical, oil and gas, and chemical processing industries.

Advantages of Viton O-Rings

• Exceptional chemical resistance
• High temperature stability
• Excellent aging resistance
• Low compression set
• Outstanding resistance to fuels
• Long service life

Limitations

Viton is less suitable for:

• Hot water
• Steam
• Certain polar solvents
• Low temperature flexibility compared to silicone

Common Applications

• Chemical plants
• Oil refineries
• Aerospace equipment
• Fuel injection systems
• Industrial valves
• High-performance engines

Operating Temperature:

-20°C to +200°CStatic applications may reach +230°C.

What Are EPDM O-Rings?

EPDM O-rings are manufactured from Ethylene Propylene Diene Monomer rubber and are widely known for their excellent resistance to water, steam, weather, ozone, and UV exposure.

They are one of the best choices for outdoor and water-based applications.

Advantages of EPDM O-Rings

• Superior weather resistance
• Excellent UV stability
• Resistant to ozone cracking
• Excellent steam resistance
• Suitable for drinking water systems
• Good flexibility

Limitations

EPDM should never be used with:

• Petroleum oils
• Diesel
• Gasoline
• Mineral lubricants

Common Applications

• Water treatment plants
• HVAC systems
• Solar energy systems
• Outdoor equipment
• Plumbing systems
• Food processing

Operating Temperature:

-50°C to +150°C

What Are Silicone O-Rings?

Silicone O-rings offer one of the widest operating temperature ranges among elastomer seals.

Their excellent flexibility, non-toxic composition, and FDA compliance make them highly suitable for food, beverage, pharmaceutical, and medical industries.

Advantages of Silicone O-Rings

• Excellent flexibility
• Food-grade compatibility
• Outstanding high temperature resistance
• Excellent low temperature performance
• UV resistant
• Odorless and non-toxic

Limitations

Silicone has relatively lower:

• Tear resistance
• Abrasion resistance
• Tensile strength

It is generally unsuitable for dynamic sealing applications involving continuous friction.

Common Applications

• Medical equipment
• Food processing
• Pharmaceutical machinery
• Beverage production
• Laboratory equipment
• Electronics

Operating Temperature:

-60°C to +230°C

NBR vs Viton vs EPDM vs Silicone O-Ring Comparison

Which Material Is Best for Your Industry?

Different industries require different sealing materials based on operating conditions.

Automotive Industry

The automotive sector commonly uses NBR O-rings for hydraulic systems, engines, transmissions, and fuel systems because they resist petroleum oils and fuels exceptionally well.

High-performance vehicles operating under extreme temperatures often require Viton O-rings.

Oil and Gas Industry

Oil refineries and petrochemical plants frequently rely on Viton O-rings because they can withstand aggressive chemicals, hydrocarbons, and elevated operating temperatures.

Water Treatment Industry

Water purification systems, plumbing installations, and wastewater plants benefit from EPDM O-rings due to their outstanding resistance to water, steam, chlorine, and weather exposure.

Food and Beverage Industry

Food manufacturing facilities typically prefer Silicone O-rings because they are odorless, flexible, FDA compliant, and suitable for extreme temperatures.

Pharmaceutical Industry

Medical equipment and pharmaceutical processing lines commonly use Silicone O-rings for hygienic sealing applications where cleanliness and non-toxicity are essential.

How to Choose the Right O-Ring Material

Before selecting an O-ring, evaluate the following factors:

Operating Temperature

Determine the minimum and maximum temperatures your equipment will experience.

Chemical Compatibility

Ensure the material is compatible with all fluids, oils, gases, solvents, and cleaning chemicals used in the system.

Pressure Conditions

Higher pressure applications may require materials with greater mechanical strength and lower compression set.

Indoor or Outdoor Use

Outdoor equipment exposed to sunlight and ozone generally performs better with EPDM or Silicone materials.

Industry Standards

Some industries require FDA, NSF, or other regulatory compliance, making Silicone or specific EPDM grades more suitable.

In applications where standard O-rings are not suitable or custom seal sizes are required, many manufacturers also rely on rubber cord to fabricate bespoke sealing solutions. Working with experienced rubber cord suppliers UAE helps ensure the right material and profile for demanding industrial environments. 

Common Mistakes When Choosing O-Rings

Selecting an O-ring solely based on price often leads to premature seal failure. Common mistakes include:

• Using EPDM with petroleum oils
• Installing NBR in prolonged outdoor environments
• Choosing Silicone for high-abrasion dynamic applications
• Using Viton for continuous steam service
• Ignoring operating temperature limits

Evaluating all environmental factors before installation helps improve sealing performance and reduce maintenance costs.

Final Thoughts

Choosing the right O-ring material is essential for achieving reliable sealing performance, longer service life, and reduced maintenance costs. By understanding the differences between NBR, Viton, EPDM, and Silicone, you can confidently select the material that best matches your operating temperature, chemicals, pressure, and application requirements.

Need Premium Industrial O-Rings?

If you’re looking for high-quality NBR, Viton, EPDM, or Silicone O-Rings for industrial applications, choose a supplier that offers reliable materials, precise sizing, and expert technical support. The right O-Ring not only improves sealing efficiency but also reduces downtime and protects critical equipment from premature failure.

Al Omran Rubber Trading supplies premium-quality O-Rings, oil seals, rubber sheets, vibration mountings, couplings, and a wide range of industrial rubber products for customers across the UAE, GCC, and Africa.

Contact our sealing solutions experts today to find the ideal O-Ring material for your application with guidance from Al Omran Rubber Trading. 

Explore Our O-Rings & Rubber Sealing Solutions

• NBR O-Rings – Nitrile Shore 70 (N70): Ideal for hydraulic, pneumatic, and oil sealing applications.
• NBR O-Rings – Nitrile Shore 90 (N90): High-hardness seals for demanding high-pressure systems.
• Viton O-Rings – FKM Shore 75 (V75): Premium sealing for chemicals, fuels, and high temperatures.
• Viton O-Rings – FKM Shore 90 (V90): Maximum performance for aggressive industrial environments.
• Silicone O-Rings – Shore 70 (SI70): Food-grade sealing for medical, pharmaceutical, and food industries.
• NBR Rubber Cord Nitrile (N70): Custom O-rings and seals with excellent oil and fuel resistance.
• Viton Cord – FKM Fluoroelastomer: High-temperature cord for custom chemical-resistant seals.
• EPDM Rubber Cord (E70): Reliable sealing for water, steam, weather, and outdoor applications.