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Sponge O-rings | Cord Bonding at Polymax

Sponge O-rings PolymaxDue to an increase in the demand for sponge O-rings we've developed a way to effectively vulcanise and bond extruded cord. This is great news for anyone who has been using our solid or sponge cords to create custom sized O-rings, as our heat and pressure vulcanisation process creates a far superior join then just using adhesive.

We can join any of our extruded cords larger then 1.5mm diameter and 18.5mm inner diameter.

What Are Sponge O-Rings Used For?

Sponge O-rings are used in static applications and provide a critical seal for housings to reach ingress protecting EN 60529, IEC 60509. Utilised in thermostats, radars, robotics, connectors, terminals, enclosures, LCD screens, monitors and computers.

Sponge O-rings offer the benefit of:

  • Closed cell structure to seal against air and water
  • Being suitable for use with non metallic applications
  • A high compression set resistance (ability to rebound to original thickness)
  • Specific characteristics available: fire retardant, oil resistant, UV resistant, ozone resistant, food and drug approved and high temperature materials
  • Absorbing irregularities in sealing faces
  • Being compatible with ultrasonic welding.


How To Measure Sponge O-rings

To work out the developed length of a seal the following calculation can be used. ID = Inner Diameter, CS = Cross Section, DL = Developed Length.

(ID + CS) x π = DL

DL/ π – CS = ID

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