Innovative intumescent fire protection gaskets for metal boxes. Electrical protection gaskets for BESA or universal boxes, where conduits pass through fire-rated ceilings and walls. BESA or universal boxes must have intumescent gaskets fitted to stop fire penetrating. Furthermore, metal socket boxes must have gaskets installed where they’re back-to-back. This also includes if cables pass through walls. Our extensive range of expanding intumescent gaskets and linings are ideal for a wide range of standard electrical boxes.