flame retardant neoprene sponge washers

Flame Retardant Neoprene Washers

Advanced Seals & Gaskets Ltd (ASG) specialises in producing a wide range of washers, including flame-retardant neoprene sponge washers. By partnering with trusted suppliers and utilising state-of-the-art manufacturing equipment, we can convert flame-retardant neoprene blocks into high-quality washers suitable for numerous industrial applications.

Our in-house facilities allow us to produce washers from blocks, sheets, or rolls starting from 1mm thick. Customers can choose from plain finishes or coatings with adhesive tapes and foils. Using precise presses, kiss-cut, or CNC machines, we manufacture washers to your exact specifications—whether you need one-off samples or high-volume batch runs.

What Are Flame Retardant Neoprene Sponge Washers?

Flame-retardant neoprene, also known as polychloroprene or CR, is a grey, closed-cell material widely used in industrial applications. Its versatility combines the durability of standard neoprene with fire-resistant properties, passing flammability tests such as FMVSS302 and UL94-HF1.

When cut into a washer shape with an inner diameter (ID) and outer diameter (OD), flame-retardant neoprene sponge washers can:

  • Provide a level surface between components

  • Act as spacers to improve the mechanical fit

  • Spread the load of nuts and bolts

  • Absorb vibration and prevent surface damage

These features make them ideal for industrial, construction, automotive, and HVAC applications.

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    Key Characteristics

    • Colour: Grey

    • Other Grades Available: Standard, Firm Grade, EPDM/Neoprene blend

    • Density: 130–170 kg/m³

    • Resistances: UV, ozone, water, oil, gases, and general weathering

    • Temperature Range: -40°C to +80°C

    • Thickness: 1mm up to 40mm without laminations

    • Standards: Tested to FMVSS302 / UL94-HF1

    Full technical data can be supplied upon request.

    Why Use Flame Retardant Neoprene Sponge Washers?

    Flame retardant neoprene sponge washers are flat, circular-shaped components with a central hole, commonly used with bolts, screws, and fasteners. They are especially effective in:

    • Creating air and liquid-tight seals in pipework and assemblies

    • Distributing load to reduce material stress

    • Acting as spacers for better mechanical alignment

    • Dampening vibration between hard surfaces

    The closed-cell structure prevents mould and bacterial growth, while providing excellent sealing properties against water and air. Their wide operating temperature range of -40°C to +80°C makes them suitable for indoor and outdoor use, including applications where abrasion and minor chemical exposure occur.

    Advantages of Using Flame Retardant Neoprene Sponge Washers

    • Fire-Resistant: Meets UL94-HF1 and FMVSS302 standards

    • Durable & Robust: Long-lasting with minimal compression loss

    • Versatile: Suitable for indoor and outdoor applications

    • Water, Oil & Chemical Resistant: Maintains performance in harsh environments

    • Vibration & Noise Dampening: Ideal for machinery, automotive, and HVAC

    • Closed-Cell Structure: Prevents mould and fungus growth

    These washers are widely used across industries including automotive, transport, construction, and HVAC due to their reliable performance and safety compliance.

    Different Types of Neoprene Sponge Washers

    ASG provides several grades of neoprene sponge to suit specific applications:

    1. Standard Neoprene Sponge Rubber:

      • Versatile and resilient

      • Resistant to UV, ozone, and weathering

      • Operating range: -40°C to +115°C

    2. Firm Grade Neoprene Sponge:

      • Higher density (180kg ±25) for heavy-duty use

      • Fire resistance tested to FMVSS 302

      • Ideal when less compression is needed for tight seals

    3. EPDM/Neoprene Blend Sponge:

      • Combines the durability of EPDM with the chemical and oil resistance of neoprene

      • Excellent for outdoor sealing applications exposed to harsh environments

    If you are unsure which grade of neoprene sponge suits your project or need samples for testing, ASG provides expert guidance and support.

    Benefits of Using Flame Retardant Neoprene Washers

    • Flame retardant for fire safety

    • Durable and long-lasting material

    • Excellent sealing against water, air, and minor chemicals

    • Sound and vibration absorbing.

    • Closed-cell design prevents bacterial and mould growth

    • Available in multiple grades and thicknesses to meet custom requirements

    Contact ASG Today


     For expert advice or to request a quote for flame retardant neoprene sponge washers, call us on 01384 252555 or submit an enquiry online.

    Have a Question about Flame Retardant Neoprene Sponge Washers?

    Please contact us using the form below or by calling us on +44(0)1384 252555.