Silicone Sponge Washers

silicone sponge washers

High-Quality Silicone Sponge Washers from Advanced Seals & Gaskets

At Advanced Seals & Gaskets Ltd, we manufacture and supply a wide range of silicone sponge washers in various grades, colours, and thicknesses. Our washers are crafted from premium silicone sponge material, available in rolls for thicknesses up to 12.5mm and sheets for thicknesses up to 45mm, both with a skin finish on both faces.

All silicone sponge washers are produced in-house, allowing us to create bespoke washers to match customer samples, drawings, or specifications, in quantities ranging from small sample batches to multi-thousand production runs.

Our advanced production facilities include presses, kiss-cut machines, and oscillating knives, ensuring precision-cut washers, whether supplied individually or kiss-cut for ease of use.

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For information on Silicone Sponge Washers please complete the following quick enquiry or call us on +44(0)1384 252555.






    Key Specifications & Characteristics

    • Colours Available: Black, White, Red Oxide, Blue 
    • Thickness Range: 1mm to 45mm 
    • Density: 200kg/m³ – 530kg/m³ 
    • Temperature Range: -60°C to +230°C 
    • Resistances: Ozone, UV, Oxidation, Corona discharge, Cosmic and Ionising Radiation, Weathering 

     Complete technical data available upon request or via our online portal.

    Download Product Specification Sheet

    What Are Silicone Sponge Washers?

    Silicone sponge washers are flat rings of elastomeric material with precise Outer Diameter (OD) and Inner Diameter (ID) measurements, designed to:

    • Reduce friction between surfaces

    • Provide stability and a level surface for bolts, nuts, and other fixings.

    • Act as water-tight or air-tight seals

    The silicone sponge material is heat-expanded and chemically cured, forming a closed-cell structure. This makes it low toxicity, CFC-free, and environmentally friendly while offering exceptional flexibility, cushioning, and vibration insulation.

    Why Use Silicone Sponge Washers?

    Silicone sponge washers are chosen for their superior mechanical and environmental properties, offering:

    • Soft and comfortable material for better sealing and cushioning

    • Excellent compression recovery, returning to the original shape after repeated use

    • Wide operating temperature range from -60°C to +230°C

    • UV and ozone resistance, suitable for harsh outdoor applications

    • Durable and long-lasting, outperforming many other sponge materials in extreme conditions

    These properties make silicone sponge washers ideal for sealing against air, dust, and water, even under low compression levels.

    Advantages of Silicone Sponge Washers

    • Closed-cell structure ensures water resistance and moisture-tight sealing.

    • Durable and rugged, suitable for industrial and outdoor applications

    • Wide operating temperature range (-60°C to 230°C)

    • Environmental resistance, including UV, ozone, and general weathering

    • Excellent recovery and compression resilience for long-term performance

    • Versatile, can be cut into bespoke sizes or custom shapes for any application

    Applications of Silicone Sponge Washers

    Silicone sponge washers are widely used across industries, including:

    • HVAC systems – sealing and vibration damping

    • Electrical enclosures – preventing moisture ingress

    • Outdoor equipment – enduring extreme weather and UV exposure

    • Industrial machinery – cushioning, vibration, and sound insulation

    • Medical and food industries – using specific grades such as food-quality silicone sponge

    Benefits of Silicone Sponge Washers

    • Strong, durable, and long-lasting

    • UV & ozone resistant for outdoor use

    • Closed-cell structure ensures airtight and watertight seals.

    • Excellent compression recovery for repeated use

    • Available in multiple grades and densities for specialised applications

    Different Grades of Silicone Sponge Available

    • Flame Retardant Silicone Sponge – fire-resistant applications

    • Food Quality Silicone Sponge – FDA and EC compliant

    • High Recovery Silicone Sponge – superior compression recovery

    • High Temperature Silicone Sponge – extreme heat applications

    • Fluorosilicone Sponge – chemical-resistant applications

    • Thermally Conductive Silicone Sponge – heat transfer applications

    At Advanced Seals & Gaskets Ltd, our silicone sponge washers are manufactured to the highest UK standards, providing custom solutions for a range of industrial, construction, automotive, and electrical applications.

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