expanSil™ Silicone Sponge Extrusions

expanSil™ is a high quality silicone sponge, offering a range of features and benefits ideal for many commercial and industrial applications.

Silicone Sponge/Foam manufactured in: Tubing, Cord, Profiles & Section
Densities from 150kg/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)
UL94V0 & EN 45545-2 grades available
Available in white, riox and grey

Silicone Sponge Extrusion Manufacturer and Supplier
All our silicone products are formulated and manufactured on site in our mill room, this allows for complete quality control at all stages of the production process. expanSil™ can be supplied in continuous lengths which improves operation efficiency for our customers in all stages of the buying process.

What is Silicone Extrusion?

Silicone extrusions are closed cell silicone lengths that can be extruded into a range of shapes. They have many application benefits across a number of industries and can be used for thermal insulation, vibration damping, sealing flexibility, insulation, noise reduction and thermal shielding.

Silicone Engineering’s expanSil™ range of sponge extrusions are manufactured, designed and developed in a continuous production process, allowing for much longer silicone sponge coil lengths. This can help significantly reduce set-up and changeover times and increase your     operational efficiency and competitive advantage. expanSil™ silicone sponge materials can also be produced as silicone sponge seals

Sponge Extrusion Applications

Our silicone extrusions can be produced to meet your exact specifications for any application. For example, we regularly supply bespoke extrusions, cut to required lengths, within the following applications:

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

Special Grades

In addition to the expanSil™ GP range, we offer specialist materials for more demanding applications or environments. These have been continuously developed, refined and improved to deliver an impressive range of silicone formulations that comply with industry standards and meet ever changing customer needs.

  • V-0 – EN45545-2, NFPA-130 & UL94V0
  • THT – High Temperature (+270°C)
  • FDA – Food Grade
  • LCH – Low Smoke & Toxicity

Silicone Sponge Densities

expanSil™ is available in several densities from 200 kg/m3 (soft) to 530 kg/m3 (very firm) and in standard colours white, red and grey. Due to the properties of cellular materials we offer a limited colour matching service for special requirements.

Sponge and Foam Cords

expanSil™ sponge silicone cord extrusions can be produced in diameters ranging from 2mm to 50mm. The cord is often cut to length and joined to form rings. Popular applications for these include use as a gasket in applications that require superior sealing properties in harsh environments.

Density (kg/m³) Diameter
200 3mm – 50mm
250 2mm – 50mm
400 2mm – 40mm
530 2mm – 40mm

Square Sections

expanSil™ sponge silicone square section can be produced from 2mm up to 60mm square. As with cords, it is often joined to form rings and used as gaskets fitted in channels to produce good sealing properties.

Density (kg/m³) Diameter
200 4mm – 50mm
250 3mm – 50mm
400 2mm – 40mm
530 2mm – 40mm

Sponge and Closed Cell Foam Tubing

expanSil™ silicone sponge and foam tubing (closed cell) available in general purpose and almost all of our special formulation grades.
Our sponge tubing can be produced from an inner diameter (ID) from 5mm up to 70mm and an outer diameter (OD) of 10mm up to 100mm.

Density (kg/m³) Min Max
250 6mm 2mm 80mm 40mm
400 6mm 2mm 60mm 18mm
530 6mm 2mm 40mm 20mm

Rectangular Sections

expanSil™ sponge silicone rectangular section can be produced from a thickness of 2.5mm and a width of up to 100mm. Applications include channel seals, where the section is located in a channel to provide a sealing surface. We have the ability to join to form rings or mitre corner gaskets.

Sponge and Closed Cell Foam Profiles

Our expanSil™ sponge profiles are produced tailored specifically to the specification of our customers and can be created in all of our general purpose and special grades.
From simple ‘P’ profiles to more complex shapes, our ability to apply our knowledge and expertise provides cost effective solutions for our customers through efficient design and manufacturing techniques.

Custom Design

By working closely with the customer we firstly assess the application and problem (if any) that is being experienced. We can then design the profile needed to perform and also the correct silicone grade to fit the application. Following production of a prototype we will robustly test the design to ensure the product performs exactly as specified.

Get in touch

Want to find out more about our products?

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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