Firefly Intuspan is a sandwich of graphite and foam that provides passive fire protection for linear gaps up to 100mm wide. It is sold in strips of various thicknesses to fill gaps of infinite length. Intuspan is easy to install as it requires no sealants or fasteners - installers simply compress it into gaps where it expands to fill the space. It can be used vertically or horizontally to fire rate control joints, construction joints, and seismic joints of up to 100mm wide.