Fire-stopping product

A sandwich panel for an internal building wall comprising:

• first and second boards, the first board extending lengthwise parallel to the second board and being transversely spaced apart from the second board and defining a gap therebetween extending parallel to the first and second boards, the first and second boards each defining a thickness,
• a fire-stopping material located in the gap, the fire-stopping material including a resilient, porous material at least partially filled throughout with an intumescent agent, the fire-stopping material having a thickness greater than the thickness of the first board and greater than the thickness of the second board,
• wherein the fire-stopping material is in the form of a strip with an elongate support,
• wherein the panel is configured to receive a service element extending transversely and completely through the first and second boards, and the fire-stopping material,
• wherein the service element is a pipe, a conduit or cable and being in direct contact with the fire-stopping material when extended through the first and second boards, and
• wherein the resilient, porous material comprises a polyurethane (PU) open-cell foam with a porosity of 10-100 pores per lineal inch.