Non-Asbestos Fibre Washers

Here at Advanced Seals & Gaskets, we produce 1000’s of washers from a variety of materials including special types such as non-asbestos fibre, a material that was developed as a replacement for Asbestos itself which is considered a dangerous substance and illegal to use.  Non-asbestos fibre washers are produced on-site using drawings or measurements provided by our customers, with whom we work closely to ensure the final product is to their exact specification.

Depending upon the size and quantity of washers required, one of many presses or CNC machines can be used to manufacture the final product, from one-off samples to multiple batches runs. Washers are a popular product as many industries require them for sealing against dust, air and moisture, gap-filling between uneven surfaces or for reducing unwanted noise and vibration.  Non-asbestos fibre washers are preferred in applications where there is exposure to extreme heat, water, petrol and natural gases.

What are Non-Asbestos Fibre Washers?

Non-asbestos fibre or CNAF (compressed non-asbestos fibre) is just one of many fibre jointing materials on offer, from which we are able to produce washers.  Non-asbestos fibre washers are a flat ring with an outer diameter (OD) and inner diameter (ID) measurement, cut from a sheet of material which is placed between two surfaces creating a level surface, acting as a spacer/ seal or between a nut/bolt to spread the pressure when tightened. Non-asbestos materials are produced using fibre and carbon, then bonded with a rubber (polymer) agent, each formulated to meet the needs of different applications, manufactured in sheets from which washers are cut in thicknesses ranging from 0.25mm up to 4mm.

Non-Asbestos Fibre Washers

Product Enquiry

For information on Non-Asbestos Fibre Washers please complete the following quick enquiry or call us on +44(0)1384 252555.

    Product Specification & Key Characteristics

    • Colour: various -  grade/brand/manufacturer specific
    • Maximum operating temperature: certain grades reaching up to 450°C
    • Thickness: 0.4mm, 0.5mm, 0.8mm, 1.5mm, 2mm, 3mm

    Full technical data can be supplied upon request,
    or downloaded from our online portal.

    Help and guidance

    If you would like to speak to a representative to discuss your specific application or requirements please call our sales office direct on 01384 469100, alternatively you can send an E-mail. Simply click on the link and forward us your details along with your question and we will contact you immediately.

    Samples - Technical Non-Asbestos Fibre Washers

    Samples can be submitted for testing upon request.

    Call now for sample requests or further help.


    Washers can be used as a gap filler, dust/air/water seal, cushion or spacer.  We manufacture washers using an extensive range of other materials including neoprene, silicone, solid rubber, sponge, plastics, polyethylene, PVC, Polyester, cork, textiles and many more, using specialist presses and CNC machinery.

    Why use Non-Asbestos Fibre Washers?

    Non-asbestos fibre has been designed to not only replace the original ‘Asbestos’ material but also to be a more superior product with countless desirable properties as the material is manufactured in various formulations, each giving a combination of properties suited for different applications. 

    The material used to manufacture non-asbestos fibre pad can be blended with nitrile, thus given fuel and oil resistance properties, with EPDM to create a potable water safe product or with PTFE for chemical resistance, they can also be supplied with a graphite coating to give steam and non-stick resistance properties.   

    Non-asbestos fibre washers can be commonly found within high-pressure applications such as compression chambers, air compressors, marine environments, diesel engines and in oil, gas, chemical and fuel processing industries.  

    Benefits of Non-Asbestos Fibre Washers

    • Water/steam resistance (selected grades)
    • Chemical Resistant
    • Fuel Resistant
    • Impermeable To Gas
    • Available in a range of grades
    • Excellent Seal

    Advantages of Using Non-Asbestos Fibre Washers

    The various grades of non-asbestos fibre materials come with countless advantages and properties that are ideal for many industries. Non-asbestos fibre washers are preferred in applications where there is exposure to extreme heat, water, petrol and natural gases. Non-asbestos fibre washers can be supplied in specifically cut shapes, easily produced using one of our many presses, kiss-cut machines and even our oscillating knife for larger/thicker washers, all available plain or coated with one of many self-adhesives.

    Different Grades

    There are various grades of non-asbestos fibre washers available, each grade created for different uses and environments, the 2 of the most popular types are detailed below.


    Novus is a compressed non-asbestos fibre-based material, usually manufactured with a polymer binder rubber, which has excellent sealing abilities. This material is ideal for a number of general-purpose applications, displaying a great resistance to the majority of fuels, oils and acids. Within the Novus non-asbestos fibre material, washers can be produced in a choice of grades, each can be identified by its colour. Each grade of Novus is manufactured using a different combination of fibres and binders to give a set of unique properties, levels of resistance and working temperature ranges.  

    **the temperatures given are to be used as a guide only - as this can vary depending on factors such as  the material thickness and pressure levels**

    Novus 10 is a black material consisting of carbon fibre and nitrile rubber. It has a maximum operating temperature of 435°C, with good steam and creep resistance, suitable for use oils, fuels and refrigerants.

    Novus, a yellow material consisting of aramid fibres and nitrile rubber. It has a maximum operating temperature of 400°C, with good resistance to general chemicals, steam, oil, fuel and gas. It has excellent water (hot and cold) resistance and is WRAS approved for potable water applications.

    Novus 26 is a green material made up of aramid fibres and natural rubber. This grade has an operating temperature of  300°C, with good swell control when exposed to oil and is resistant to water, ideal for automotive applications.

    Novus 30 is orange in colour, consisting of both aramid fibres and inorganic, with a nitrile rubber binder. It has a maximum operating temperature of 400°C, with good all-round resistance to water, steam, oil, fuel, chemicals and gas.

    Novus 34 is manufactured white in colour, using a combination of aramid fibres, inorganic fibres, special additives and nitrile rubber.  This grade has a maximum working temperature of 450°C, with good resistance to gases, solvents, oils and high-pressure steam.

    Novus 45 is a blue material containing recycled synthetic fibre jointing and nitrile rubber.  Novus 45 has a maximum operating temperature of 300°C, with good resistance to milder chemicals, low-pressure steam, fuel and oil.


    Klinger is another popular non-asbestos fibre material from which ASG can cut and supply washers.  Klinger is manufactured in a variety of grades each suited for a range of environments and applications, each grade is produced using a combination of materials chosen to produce a product with various high-level resistances and a range of maximum working temperatures. Generally, washers manufactured using Klinger will have good resistance to water, petrol, oils, solvents, gases, steam and some acids/alkalis.  Klinger materials can often be found in sealing applications within oil, gas, petrochemical, power generation and aerospace industries.

    C4324 is charcoal/anthracite in colour, comprising aramid glass fibre and nitrile rubber.  This grade has a maximum operating temperature of 324°C, is fully WRAS approved for use with potable water,  suitable for use with oils and fuels, and has moderate resistance to steam, water, and natural gases.

    C4400 is recognisable by its blue colour, produced using aramid fibres and nitrile rubber binders.  C4400 has a maximum working temperature of 400°C, suitable for high-pressure environments and has good resistance to air, water, steam, saltwater, fuel, oil, gas and acids

    Grade C4430 is silver/grey in colour, a premium grade product, made using aramid fibres and a nitrile rubber binder.  This grade has a maximum operating temperature of  430°C and offers exceptional compressive strength, good resistance to hot water steam, oil, grease fuel, alcohol acids and lubricants.

    C4500 materials are dark grey in colour, made from a composition of carbon fibres, nitrile rubber and a heat resistant additive.  This material has a maximum operating temperature of 450°C, and can be used in chemical industries, or where resistance to oil, gases, salt solutions, fuels, alcohols, acids, hydrocarbons, refrigerants, and lubricants is required.

    For further information on the grades of non-asbestos pads or for help choosing the best material for your application,  please get in touch with our team

    Have a Question about Non-Asbestos Fiber Washers?

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