The Astroflame intumescent socket box inserts and covers are applied inside electrical socket boxes. In the event of a fire the intumescent material expands and fills the electrical box stopping the spread of fire and smoke. These socket box inserts and covers have been tested to BS476-20 and are designed to comply with IEEE regulations.
BS 476 is the British Standard for fire tests on building materials and structures. However, this standard has been superseded by the current BS EN 1634-1, working in conjunction with BS 476-20, which outlines the methods for determination of the fire resistance of construction elements. BS EN 1634-1:2014 is a standard covering: Fire resistance and smoke control tests for door and shutter assemblies, openable windows and elements of building hardware. For products to comply with BS EN 1634-1, they must be able to withstand fire attack, not allow flames or hot gases to pass, and maintain the fire integrity of a doorset.
As an additional fire safety precaution, intumescent products may be installed around socket boxes, either internally or externally, to provide further fire protection on electrical equipment and help to prevent electrical fires. The aim of the intumescent material is to provide fire compartmentation when an aperture has been made for the installation of light switches or plug sockets within a wall. Without the intumescent material, if a fire was to break out, it would quickly enter and pass through the wall to more easily spread throughout a premises. Installed intumescent products act as a fire stop / smoke seal for these applications, as well as providing some improvement on acoustic performance.