Silicone sponge solid cord is manufactured from closed cell cellular silicone rubber using extrusion manufacturing. It is available in a wide range of diameters, colours and specialist grades.

The unique nature of sponge allows for enhanced levels of compressibility and weight reduction over standard silicone rubber cord.

Silpro supply silicone sponge extruded cord in the following materials:-

  • SP400-10 – Very soft
  • SP400-16 – Medium soft
  • SP400-24 – Medium
  • SP400-32 – Hard


The ability to fill uneven gaps / cavities is a leading attribute of silicone sponge cord. This along with the protection it can offer against moisture and dust ingress means this product is widely used in sealing environments.

As well as its use in industry, Silpro have also supplied bespoke colour-matched cords for design and aesthetical applications where look and feels are the primary consideration.

Manufacturing Capabilities

Sponge cord is commonly available in diameters from 1mm to 40mm; however it is possible to extrude larger (up to 100mm). It can be supplied in a comprehensive range of specialist materials including:-

  • High Tear Strength
  • High Temperature – 250C upwards
  • Fire Retardant
  • Metal Detectable
  • Fluorosilicone – for enhanced chemical resistance
  • FDA Compliant (FDA 177.2600 and EC 1935/2004 standards)

Adding Value

Silicone sponge cord can be supplied in cut lengths or joined to o-rings using RTV (room temperature vulcanised) or heat cured adhesives. Our on-site cutting and fabrication equipment and experienced staff ensures means Silpro can offer this service to supply you a finished, ready to fit component.

Silpro can supply quantities of sponge cord starting from 10 metre upwards, depending on your requirement we may be able to ship from stock; ideal for production stoppages or rapid prototyping