Silicone Sponge Sheet

Viking Extrusions have 30 years’ experience supplying silicone sponge sheeting and other silicone components to industry worldwide. Over this time, we have gained a vast amount of knowledge and expertise which allows us to ensure you receive the right material for your application.

What is Silicone Sponge Sheeting?

Silicone sponge rubber is an elastomeric material with a closed cell structure that has been developed to provide exceptional sealing properties, vibration dampening, insulation and cushioning.

Silicone sponge sheeting availability

We can supply silicone sponge sheeting to the following specifications:

Available in densities from 150kg/m³ (very soft) to 530kg/m³ (firm).
Available in 1000mm x 600mm sheets.
Supplied in thicknesses from 1.6mm to 40mm.

Silicone Sponge Grades

We can offer a range of specialised grades of silicone sponge sheeting including:

Metal Detectable Silicone Sponge – ideal for use for gaskets and seals in food processing areas. If any parts of the seal break off into the food product, they can be detected and removed.
HT800 Silicone Sponge – Flame retardant silicone sponge sheet, compliant with EN45545 (depending on thickness) and UL94 V-0.
FDA Approved Silicone Sponge Sheet – Compliant with CFR 21 177.2600 for use in food and beverage processing applications.
‘HTM’ Closed Cell Silicone Sponge – Thermally conductive silicone sponge, used for gaskets and pads which require good heat transfer.

Secondary Operations

Self-Adhesive backing – Silicone sponge sheets can be supplied with self-adhesive backing.
Silicone sponge gaskets – We are able to supply gaskets cut from silicone sponge sheet, for more information visit our Silicone Gaskets page
Converted into strips – Silicone sponge sheet can be supplied slit into strips of any required width.

What are the advantages of silicone sponge sheet?

Silicone sponge sheet has many advantageous properties including:

Wide Operating Temperature – silicone sponge sheet is thermally stable over temperatures ranging from -60°C to +230°C.
Extremely low water absorption - typically less than 1%. Silicone sponge’s closed cell structure offers excellent water sealing at low compressive forces.
UV and Ozone Resistance – due to their chemical structure, silicone products have excellent UV and Ozone resistance, making them an ideal choice for applications requiring long term performance.

What are the applications for silicone sponge sheet?

Silicone sponge sheeting offers excellent compression properties and is used to produce a variety of gaskets and seals. It is especially useful when sealing surfaces are not smooth. Typical applications for silicone sponge sheeting include:

Transfer printing pads

HVAC units

Weather and glazing seals

Sealing for electronic enclosures

Adhesive application pads

Lighting systems

Automotive seals

Locomotive and carriage seals

Domestic appliance seals

What are the differences between open cell and closed cell silicone sponge?

Open Cell Foam

With open cell sponge, each cell or bubble is openly connected to the next cell. As these cells are not separated water, dust and moisture can make its way through the cell structure.

An example of this would be a commonly used sponge for cleaning, which soaks up water by allowing it to pass through each cell to be held within the sponge.

Closed Cell Sponge

Closed cell sponge has very different structure to open cell sponge. In a closed cell sponge each cell is a completely closed separated sphere, with air trapped in each cell. The lack of connectivity between cells means that water, dust or moisture cannot readily pass through the cell structure. Closed cell sponge has very low water absorption and is an ideal material choice for sealing applications where water and dust ingress are to be prevented.

The term “sponge” is generally used to describe a closed cell product and the term “foam” for an open cell product.

Get in touch with Viking Extrusions

Contact our expert team of silicone engineers for advice, quotations or any other queries.