Industrial Grade O Ring Cord Stock for Custom Sealing Solutions

When a machine grinds to a halt because of a missing seal, you don’t always
have the luxury of waiting for the exact molded O-ring size to arrive. That’s
where O-ring cords step in. They’re simply continuous lengths of round
elastomer, ready to be cut and joined into whatever diameter your application
calls for. Not a replacement for every sealing need—but an invaluable tool
when speed and flexibility are top priority.

When to Reach for O-Ring Cords

· Tight access – If the groove is trapped inside an assembly you can’t
easily dismantle, you can lay a cord in place and join the ends without a full
teardown.

· Zero spare parts on hand – No stock for that exact AS568 size? Cut and bond
a o ring cord to get production moving again.

· Static service only – The joint will always be your weakest link, so these
cords are best in non-pressurized, non-moving interfaces. For pressure or
motion, molded O-rings—or even an X-ring—are the safer bet.

Material Options

· NBR (Nitrile) – Budget-friendly, reliable with most lubricating and
hydraulic oils, but heat limit around +125 °C. Not ideal outdoors long-term
due to UV aging.

· FKM (Viton®) – Higher temperature resistance (up to +250 °C), strong
against many chemicals, but avoid hot water/steam. Stiffer at low temperatures
(−20 °C and below).

Your decision should balance four factors: the fluid or gas being sealed,
operating temperature peaks and averages, pressure conditions, and uptime
needs. In regulated industries or with harsh solvents, always confirm the
compound’s compliance and compatibility.

Getting the Joint Right

· Cut quality counts – Whether you go with a straight cut or a scarf joint,
keep it clean and square. The adhesive layer should be thin and even—excess
glue won’t help.

· Better alignment pays off – Heat-vulcanizing or using alignment sleeves can
reduce seam stress, which matters in precision grooves.

· Mind the groove design – All standard O-ring groove rules still apply:
squeeze, chamfer, and surface finish all affect sealing.

Remember—the seam will usually fail first. If your environment cycles in
temperature or causes swelling, expect to replace the cord on a schedule.

Where They Excel

· Static covers, flanges, and access plates in pumps, gearboxes, and housings.

· Large custom diameters—think inspection ports on tanks, process vessels,
and wind turbine gearcases.

· Enclosures for robotics or electronics where seals aren’t under pressure.

· For mission-critical systems in aerospace, rail, or defense, O-ring cords
are generally a short-term workaround, not a permanent fix.

Tips for Maintenance Teams

· Choose cross-section size to match wear tolerance and groove control.

· Record seam position and adhesive type for future reference.

· Keep spare cord stock in both NBR and FKM for rapid response.

The DEDE Advantage

With over three decades in sealing technology, DEDE supplies O-ring cords in a
wide range of materials and sizes, along with molded O-rings, oil seals, and
precision cords. Whether it’s a rush delivery or a full custom solution—from
material selection to prototype—we help minimize downtime and maximize seal
life. Our products serve industries in over 80 countries, backed by in-house
manufacturing, testing, and recognized technology innovation status.

If you need a seal now, and a closed ring isn’t an option, O-ring cords can
save the shift. For pressure, motion, or long-term reliability, switch to
molded rings or specialized profiles once the emergency is past. Tell us your
medium, temperature, pressure, and downtime limits—we’ll match you with the
most reliable option.

Minimum Order: 100 metres

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