Features and Benefits of expanSil™ Silicone Sponge Extrusion

As a silicone sponge extrusion manufacturer of expanSil™, our unique, high quality sponge material offers a variety of features and benefits ideal for many applications.


  • Manufactured in tubing, cord, profiles & sections
  • Densities from 200kg/m³ (soft) to 530 kg/m³ (firm)
  • Excellent Ozone and UV resistance
  • Closed Cell
  • Thermally stable over a wide range of temperatures (-60°C to 230°C)
  • Available in white, riox and grey

Silicone Sponge Extrusions are Supplied and used in the following applications:

  • Electrical Enclosure Seals
  • Insulation
  • Outdoor Lighting Gaskets
  • HVAC Seals
  • Door Seals
  • Outdoor Digital Signage

Silicone Sponge

However, Silicone Engineering will continue to use conventional methods, where appropriate, to ensure each silicone sponge extrusion matches your unique requirements and specifications. expanSil™ is available in several densities from 200 kg/m3 (soft) to 530 kg/m3 (firm) and in standard colours white, red (riox) and grey. Owing to the properties of cellular materials, Silicone Engineering offers a limited colour matching service for special requirements. expanSil™GP materials offer all the resilience and versatility of silicone rubber and are ideal for industries where adverse temperatures are an issue or alternatively, where there are uneven sealing surfaces requiring a supple material.

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Technical data is available on all Silicone Engineering products. For more details, download the product information or speak to one of Silicone Engineering’s dedicated specialists.

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