Tenmat FF130 Electrical Box Inserts


    Designed to maintain the fire resistance performance of fire rated partition (stud) wall constructions where electrical back boxes have been installed.

    • BS EN 1366-3 Fire Tested
    • Fire Ratings of EI30, EI60, EI90 and EI120
    • Tested in Single Layer & Double Layer Partition Systems
    • Tested in 75mm thick walls and greater
    • Tested in “Twin Wall” Fire & Acoustic Partitions
    • Acoustically Tested / Limits Air Leakage
    • Back to Back tested in many applications
    • Suitable and tested for both plastic pattress boxes and metal back boxes
    • Available for single and double boxes (35mm and 47mm Depths available)
    • Tested with multiple cable penetrations

    £2.77(ex. VAT)
    £3.32 (inc. VAT)
    Please choose your colour
    Available for Delivery (See Delivery Options Below)


    Tenmat’s Socket Box Inserts, are manufactured from halogen free, low smoke, fire resistant, mineral fibre material and are designed to maintain the fire performance of partition (stud) wall constructions when penetrated by steel or plastic electrical back boxes. The insert will also provide resistance to the passage of sound and air movement.

    In the event of a fire the Socket Box Inserts mineral fibre material will prevent the fire passing through the electrical back box aperture, providing effective fire resistance, for integrity (E) and insulation (I) from 30 to 120 minutes (EI30 to EI120) depending upon the wall construction.

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    Ordering Reference

    ReferenceNameSocket TypeDepth
    EXB35/SingleFF130 Socket Box InsertsSingle35mm

    Fitting Instructions

    1. Fit the electrical back box into the aperture in the wall following the manufacturer’s instructions, ensuring the back box is fitted tightly, gaps between the sides of the back box and the hole cut through the plasterboard must be as small as practicable.

      Plastic pattress boxes must sit flush to the face of the wall. Metal back boxes can be flush or recessed (see fire test data table for max. recess depth).

    2. Cable Install Options:

      Option 1) Pierce a hole, as small as possible, through the Socket Box Insert to allow cable to pass through.


      Option 2) Make a small slit in the Socket Box Insert to allow retro fitting around cables. Slit must be as small as possible and should close back up once cables installed. (As long as the slit is closed back up, it does not need to be sealed).

      Max 3No. Cables per Socket in min. 100mm thick EI30/60/90/120 partitions.

      Max 7No. Cables per Socket in min. 190mm thick EI60 partitions.

    3. Fit the Socket Box Insert into the back box and pierce two small holes through the face of the insert in the position required for the face plate fixing screws. Alternatively, the Socket Box Insert can be slit at the screw location point to aid installation around fixing screws.

      The flange of the Socket Box Insert should sit in front of outer plasterboard layer in all cases except in Metal Back Boxes in up to 60 Minute Rated Partitions where the Socket Box Insert may be recessed by up to 20mm. The width of the flange of the Socket Box Insert may be trimmed to allow recessed fitting, however the depth of the Socket Box Insert must not be reduced.

    4. Make the electrical connections as required to the switch/socket cover plate and fit the face plate in the normal manner.
    5. Any excess insert material visible around the sides of the fitted switch/socket cover plate may be trimmed off.


    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
    Professional Use
    Interior / Exterior Use
    Interior Use
    Single, Two or Three Pack
    Single Pack
    Key Features
    Fire tested to BS EN 1364-1 & BS EN 1363-1
    Key Features
    Air Leakage tested to BS EN 1026
    Key Features
    2 Hours Fire Rated
    Key Features
    Acoustically tested to ISO 140-3, up to 67dB
    Suitable For Use On
    Application Method
    Application Method
    Product Type
    Fire Seal

    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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    Tenmat FF130 Electrical Box Inserts 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