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.
Good lifetime
Very good price-performance ratio
Suitable for many industrial applications