Intumescent Seals Therm-A-Strip


    Therm-A-Strip is a low pressure intumescent strip material which has been developed for applications where a pressure forming product is disadvantageous. The degree of expansion is moderate in order to provide some resistance to erosion.

    • Flexible phosphate based intumescent product
    • Gives an approximate ten fold increase in volume when exposed to heat
    • Activation temperature: around 180ºC
    • Supplied in a natural white finish
    • Resistant to both atmospheric moisture and carbon dioxide
    • Requires no additional surface protection
    • May be decorated with a wide range of conventional finishes without impairing the performance

    Please Note: 25mm x 2mm x 2100mm and 10mm x 1mm x 2100mm sizes are Made To Order with and extended lead time of 20-30 Working Days

    £5.51(ex. VAT)
    £6.61 (inc. VAT)
    Please choose your colour
    Available for Delivery (See Delivery Options Below)


    Therm-A-Strip has been developed to provide excellent sealing properties combined with the benefit of a flexible strip of intumescent material. It is particularly useful in cases where there is a possibility of localized flaming due to combustible products since it generates fire retardant gases when heated.

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    Self-adhesive backing.

    Test Evidence

    Therm-A-Strip has been successfully tested as a component of various doorsets to meet the fire resistance performance requirements of BS 476:Part 20 & 22. It is currently being evaluated to BS EN-1634-1.

    Copies of test reports and assessment evidence are available on request.

    IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contacted to obtain a tailored specification and any advice necessary before you place an order for fire protection products. Fire protection products are non-returnable except in accordance with Condition 8 of the Terms and Conditions and should be applied only by an individual with the necessary expertise and experience. We will not be held liable for any resulting damage to property, human life or monetary costs incurred due to the incorrect specification you have prepared or use of fire protection products caused by your negligence, including your failure to have contacted us to obtain the relevant advice/specification.

    Product Details

    Data sheet

    For Use By
    Consumer Use
    For Use On
    Timber Fire Doors
    Suitable For Use On
    Timber Fire Doors
    30 Minutes Fire Resistance
    Product Type
    Product Range
    Intumescent Seals
    Colour Family

    Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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    Intumescent Seals Therm-A-Strip is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.

    Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.

    Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.

    All delivery costs below are excluding VAT