The UK’s Largest Stockist

Polymax is the UK’s leading distributor of FKM (Viton®) O-rings and seals, providing access to over 100,000 sizes and compound options for high-performance sealing solutions. FKM O-rings are renowned for exceptional chemical resistance, high-temperature stability, and long-term durability, making them ideal for oil, fuel, chemical, automotive, aerospace, and industrial sealing applications.

With EN 549 compliance and a range of hardness grades and colour options, Polymax FKM O-rings deliver reliable, durable sealing solutions for critical industries where failure is not an option.

Comprehensive Range of FKM Viton® O-Rings

Polymax supplies FKM O-rings engineered for the most demanding environments, including:

• Automotive applications: Fuel systems, engine seals, transmissions, and brake systems.
• Chemical processing: Acids, alkalis, and aggressive solvents.
• Industrial machinery: Pumps, valves, compressors, and hydraulic systems.
• Oil and petroleum exposure: Resistant to hydrocarbon fuels and lubricants.
• High-temperature environments: Stable performance above 200°C, with some grades exceeding 300°C.
• EN 549-compliant sealing: Suitable for automotive and industrial applications requiring regulatory adherence.
• Vacuum and high-pressure systems: Reliable sealing in extreme conditions.

We stock British Standard, AS568, metric, and fully custom FKM O-rings, ensuring compatibility with standard housings and bespoke equipment.

Hardness and Temperature Range

Polymax FKM O-rings are available in a wide range of hardness grades, typically 60–90 Shore A, allowing precise selection for:

• Optimal compression and sealing force
• Wear and abrasion resistance
• Mechanical performance in dynamic and static applications

Temperature performance varies by compound, but standard FKM O-rings reliably operate from -20°C to +200°C, with specialty grades capable of withstanding temperatures up to 300°C. This makes FKM O-rings ideal for high-heat automotive, industrial, and chemical applications.

Certified FKM O-Rings for High-Performance Sealing

Polymax FKM O-rings meet stringent international standards, including:

• EN 549: Compliance for industrial and automotive elastomers
• ASTM and ISO standards: Industrial and mechanical sealing requirements
• FDA and USP Class VI: Suitable for limited food and medical contact in approved applications
• UL94 HB: Flame-retardant options available

These certifications provide confidence that our FKM O-rings deliver long-term performance, chemical resistance, and regulatory compliance, while cost-effective alternatives to premium branded FKM O-rings are available without sacrificing quality.

Why Choose Polymax FKM (Viton®) O-Rings?

• Extensive stock of FKM O-rings in standard and custom sizes
• High-performance FKM compounds for chemical, oil, and high-temperature applications
• EN 549, ASTM, ISO-certified seals
• Wide range of hardness grades and colour options
• Expert technical support for material, hardness, and performance guidance
• Cost-effective alternatives to branded FKM O-rings
• Easy online ordering, real-time stock visibility, and fast UK delivery

If you are unsure which FKM O-ring is suitable for your application, our team of experts is ready to assist.

Need help selecting the right FKM (Viton®) O-ring? Contact our technical specialists today at +44 (0)1420 474 123 or email [email protected].