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Static Seals Cord Header

Round Cords and Round Cord Rings

Endless Round Cords for Static Applications

Round cords are manufactured by extrusion and delivered by the meter. Compared to O-rings, round cords can be used as endless round cords or with a joint as a round cord ring. However, they are subject to larger tolerances in the inner diameter (d1) as well as in the cord diameter (d2). Round cords are used for sealing larger pipe joints and cover sealing, e.g. in tank construction. They are often used for on-site repairs, where they are joined "to size". Cords cannot be used in a vacuum.

The cords can be joined together to form a bonded O-ring using cyanoacrylate or 2-component adhesives. For more special applications like in seawater, bonding using a final vulcanization process is required. In general, it is possible to fabricate any of our compounds into O-rings, gaskets or extrusions.

Benefits at a Glance

  • High flexibility
  • Delivery takes place on cardboard spools
  • Resistance of cord materials as for O-rings. The joint must be considered separately
  • Tolerances for NBR, FKM and EPDM according to ISO 3302-1 E1, for VMQ according to ISO 3302-1 E2
  • The material VMQ 60 is suited for contact with food. The corresponding reference tests are compliant with FDA requirements (21 CFR § 177.200) and LFGB recommendation XV (EC 1935/2004)
  • Good lifetime
  • Very good price-performance ratio
  • Suitable for many industrial applications

Important note: Dichtomatik products comply with common industrial standards and therefore are suitable for many applications excluding safety-critical ones like Automotive. Premium Freudenberg products are the right choice for all applications ensuring highest quality and safety standards and therefore optimal total cost of ownership.


Choose the Right Product

Out of Four Types

Round cords and round cord rings of the Dichtomatik brand are available in

  • NBR
  • EPDM peroxide
  • FKM
  • VMQ

Further materials are available on request. We also offer Dichtomatik repair kits for round cord rings (offers may vary per region). For more information, please contact us.

    Related Documents

  • Brochures 66-plus 67-minus


    Product Overview - Dichtomatik Brand

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  • Industry Certificates 66-plus 67-minus


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    An overview of our compounds which are certified for special applications.

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  • Solutions Sheets 66-plus 67-minus


    Round Cords and Round Cord Rings

    Round cords and round cord rings from the product brand Dichtomatik achieve their sealing effect from the deformation of the cross section after installation and compression into the installation space. As static seals, they are superbly suited for tube fittings and cap seals in container construction.

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Product Portfolio

Sealing products setting benchmarks

Premium products and individual sealing solutions of the Freudenberg brand are the perfect choice for any application. Uncompromising quality (0-defect strategy) and excellent performance ensure full safety and optimized total cost of ownership (TCO).

Freudenberg Product Portfolio 70-external-link