These integral electrical putty pads have been designed for dry lining socket or switch boxes which are made from either plastic or metal.
Very easy to fit they will protect boxes from fire for up to 4 hours where conduits pass through fire rated walls or ceilings or when boxes are located back to back.
They are available in multiple sizes to fit varying socket boxes housing electric wires, there is also an acoustic version available.
They meet electrical and plumbing IET wiring regulations as well as Document B & E of Building Regulations, tested to European and British Standards to BS476 parts 20 & 22
EG 30 Socket / Switch Box Inserts
Pack size gives you 20 pcs enough for 10 Socket / Switch Boxes