What Is Silicone Sponge? Applications, Benefits, and Buying Advice

Silicone sponge is a lightweight, flexible material widely used in industries that demand reliable sealing, insulation, and high performance under extreme conditions. Unlike solid rubber or foam, silicone sponge has a unique cellular structure that makes it compressible yet durable—ideal for challenging environments across the UK.

In this guide, we’ll explain what silicone sponge is, explore its most common applications, outline its key benefits, and share advice on choosing the right product for your needs.

What Is Silicone Sponge?

Silicone sponge is a closed-cell or open-cell elastomer made from silicone rubber. It’s formed through a foaming process, creating small, sealed pockets of air within the material. This structure gives the sponge excellent compressibility, flexibility, and thermal insulation properties.

Two common formats include:

  • Closed cell – Better for water and air sealing
  • Open cell – More breathable and cushioning

At Silicone Rubber Products, we supply a range of silicone sponge options in various sizes and densities for general and specialised use.

Key Applications of Silicone Sponge

Thanks to its durability and resistance to extreme conditions, it trusted in a variety of industries throughout the UK:

1. Sealing and Gasketing

Used in both static and dynamic sealing situations, silicone sponge sheet and strip are ideal for gaskets that need to compress and rebound over time.

2. Thermal Insulation

A popular choice for high temperature silicone sponge applications such as ovens, heating equipment, and insulation panels. It remains stable from -60°C to +230°C or higher.

3. Vibration Dampening

Acts as a cushion to reduce shock and vibration in machinery and transport equipment.

4. Food & Beverage Industry

Food grade silicone sponge is compliant with hygiene standards and used in appliances, bottling lines, and sealing in food preparation areas.

5. Electrical Enclosures

Prevents dust and moisture from entering control panels, helping to maintain IP ratings.

Benefits of Using Silicone Sponge

Here’s why more UK manufacturers, engineers, and fabricators are turning to silicone sponge:

  • Temperature Resistance – Withstands extreme heat and cold
  • Excellent Compression Set – Recovers shape after compression
  • Water & Air Sealing – Especially true for closed cell sponge
  • Non-Toxic & Food Safe – Available in FDA-approved formulations
  • Weather & UV Resistant – Ideal for both indoor and outdoor use
  • Lightweight & Flexible – Easy to cut, shape, and install

Product Formats Available

At Silicone Rubber Products, we offer silicone sponge in a variety of forms to suit your specific project:

  • Sheet – Available in standard thicknesses or custom sizes
  • Roll – Supplied in long lengths for industrial applications
  • Strip – Precision cut for sealing and edge protection
  • Custom – Fabricated to your specifications

Whether you need a soft sponge for cushioning or a flexible sponge for irregular surfaces, we’ve got the right solution.

Buying Advice: What to Consider

When selecting a silicone sponge for your project, keep the following in mind:

1. Application Environment

Will it be exposed to high temperatures, weather, oils, or chemicals? Choose a grade that matches the environment.

2. Cell Structure

Use closed cell for better sealing against air, water, or dust. Open cell may be better for breathability or cushioning.

3. Compression Requirements

Check how much deflection the sponge will undergo. Some applications need a firmer density to avoid permanent deformation.

4. Certifications

For food or medical use, select a food grade silicone sponge that complies with relevant standards (FDA, WRAS, etc.).

5. Format & Size

Decide between sheets, rolls, strips, or bespoke fabrications depending on installation and handling requirements.

Why Choose a UK Supplier?

Working with a trusted UK supplier ensures:

  • Fast, local delivery
  • Compliance with British and EU regulations
  • Access to custom cutting and design support
  • Expert advice tailored to UK industries and climates

You can explore our full range at Silicone Rubber Products.

Contact Us for Expert Support

Need help selecting the right silicone sponge? Our technical team is here to assist you with product selection, sizing, and custom orders.

Phone: 01903 732088
Email: sales@silcoproducts.co.uk

Explore our full range online or request a quote for a custom specification. Visit our Silicone Sponge product page for more information.

Frequently Asked Questions

Q1: What temperature can it withstand?
A1: Standard grades typically handle from -60°C to +230°C, with some specialised versions tolerating even higher.

Q2: Is it waterproof?
A2: Closed cell silicone sponge is water-resistant and suitable for sealing applications exposed to moisture.

Q3: Can it be used in food processing environments?
A3: Yes, food grade sponge is available and widely used in compliant food and beverage settings.