EPDM Rubber O-Rings

EPDM is the standard elastomer for outdoor and weather-exposed O-ring applications. It has superior resistance to ozone, UV, and sunlight, with good resistance to steam, brake fluid, and many polar solvents. EPDM is available in sulfur-cured or peroxide-cured formulations — peroxide cures offer better high-temperature performance and lower compression set, important on long-service-life O-rings.

Durometer
40A to 80A
Highlight
Weather & ozone resistant
Request a Quote909.355.1547
Custom EPDM O-rings from Cannon Gasket
Get pricing

Request a quote for EPDM o-rings.

Properties of EPDM o-rings

Cannon Gasket cuts EPDM o-rings to your drawing in durometer and thickness specifications of 40A to 80A Shore hardness. Excellent resistance to ozone, UV, water, steam, brake fluids, dilute acids, and alkalis. Not suitable for petroleum-based oils or fuels.

EPDM tolerances and customization

Standard dimensional tolerances on EPDM o-rings land around ±0.010" to ±0.015" on OD and ID, depending on material durometer and thickness. Tighter tolerances are available on selected grades. Cannon Gasket cuts EPDM to custom profiles in-house and matches lead times to your production volume. PSA backing, pad printing, custom packaging, and kitting are all on the menu when you need them.

Manufacturing, finishing & stocking

Standard sizes: Standard AS568 O-ring sizes are available; see the AS568 O-Ring Size Chart for the full size reference. Custom cross-sections and inside diameters are cut to your specification.

Clean room: Cannon Gasket offers clean-environment stamping for medical, FDA, electronic, and scientific applications where a controlled level of particulate is required, with capabilities to meet ISO Class 10,000.

Stocking agreements: Blanket orders, VMI (vendor-managed inventory), JIT (just-in-time), and Kanban replenishment programs.

Pad printing: Pad print your part number, identification marking, or company name in a range of ink colors. Marking per customer specifications or MIL-STD-130.

Packaging: Parts are bagged and tagged in specified quantities and labeled with P/N or any required information. Capability to meet specific packaging and labeling requirements.

Request a QuoteEPDM O-RingsDownload PDFPrint-ready spec sheetClaude SkillExpert prompt .md
Key Properties
  • Durometer: 40A – 80A
  • Weather & ozone resistant
  • UV & steam resistant
  • FDA grades available
  • AS568 standard sizes
Engineering Tools
Applications
Ready to quote?
Submit your drawing or specifications and we'll respond with pricing and lead times.
Request a Quote
or call 909.355.1547
Keep Exploring

Related products, materials & reading.

Material
Fluorosilicone O-Rings
Fluorosilicone rubber O-rings rated -100F to 400F combining fuel, oil, and solvent resistance with silicone flexibility.
Material
Neoprene O-Rings
Neoprene rubber O-rings rated -40F to 250F with moderate resistance to oils, weather, water, and ozone.
Product
Lathe Cut Washers
Lathe-cut seals and washers from tube stock, tight dimensional control.
Article
Common Reasons O-Rings Fail
Installation, material selection, and environment, the top failure modes.
Frequently Asked Questions

Common EPDM questions.

Are you ISO 9001 certified?
Yes, ISO 9001:2015 certified. Documented quality management covers incoming material verification, in-process inspection, calibrated measurement, final inspection, non-conformance handling, corrective action, and full lot traceability. AS9100-ready for aerospace, with MIL-spec and FDA 21 CFR 177.2600 / USP Class VI grades available on request.
Do you stock standard AS568 O-ring sizes?
Yes, all AS568 dash numbers in common compounds (Buna-N, Viton, Silicone, EPDM) are available. Our AS568 size-chart tool on /tools/o-ring-size-chart/ has the full dimensional reference. Custom non-standard sizes quoted from drawing.
What is a lathe-cut O-ring?
A lathe-cut seal is turned from tube stock instead of molded. Square cross-section instead of round. Lower tooling cost and often better dimensional stability than molded O-rings at low-to-mid volume. See /lathe-cut-washers/ for details.
What is the difference between dynamic and static O-ring applications?
Static means the O-ring is compressed between non-moving surfaces (flange gasket, cap seal). Dynamic means at least one mating surface moves relative to the O-ring (piston seal, rotary shaft). Dynamic applications need a harder durometer, tighter clearances, and sometimes lubricated surfaces.
Why do O-rings fail?
Three big killers: abrasion from rough mating surfaces, chemical attack that swells or hardens the elastomer, and extrusion from too-large clearance gaps under pressure. Our Common Reasons O-Rings Fail article walks through diagnostic signs.
How fast do you return a quote?
Most RFQs come back within one business day. Simple profile updates to an existing tool quote same-day. Send a drawing, DXF, or competing part number and our engineering team reviews material, tolerance, and volume before pricing.
What is the minimum order quantity?
Minimums depend on the part and material. We cut prototype and first-article quantities for engineering evaluation, then scale up to production volumes from the same tooling. For high-volume programs we run JIT, VMI, and Kanban replenishment out of Fontana, California.
What should I send with an RFQ?
Ideal: a drawing or DXF, material spec (or compound family), estimated annual volume, and any regulatory callouts (FDA, USP Class VI, AS9100, MIL-spec). If you only have a sample or a part number from a competing supplier, send that and we will reverse-engineer the spec before quoting.
What are typical lead times?
Prototype and first-article parts usually ship in 5-10 business days. Production runs from existing tooling are 2-3 weeks depending on volume and material lead time. Rush and expedite options available on a case-by-case basis.
Need custom EPDM O-rings?
Standard AS568 sizes and custom configurations available.
Request a QuoteContact Us
ISO 9001 CertifiedAS9100-ReadyMIL-Spec CompatibleFDA / USP Class VIEst. 1971ISO 9001 CertifiedAS9100-ReadyMIL-Spec CompatibleFDA / USP Class VIEst. 1971ISO 9001 CertifiedAS9100-ReadyMIL-Spec CompatibleFDA / USP Class VIEst. 1971ISO 9001 CertifiedAS9100-ReadyMIL-Spec CompatibleFDA / USP Class VIEst. 1971