TECHNOLOGY FOCUS - POLYMERS - Preferred Back-sheet: In the back-sheet, the crystallized mineral silicate platelets of the flame resistant sheet are selected from mica, vermiculite, calcined clay, silica, talc, wollastonite, and combinations. The crystallized mineral silicate platelets of the flame resistant sheet are mica particles, where the flame resistant sheet is a flexible sheet comprised of at least 70% by weight mica based on the weight of the flame resistant sheet. The crystallized mineral silicate platelets are vermiculite particles. The flame resistant sheet is a flexible sheet comprised of at least 70% by weight vermiculite based on the weight of the flame resistant sheet. The crystallized mineral silicate platelets have an average diameter of about 1 to about 500 microns and an average thickness of about 0.01 to about 2 microns, and where the average diameter of the mineral silicate platelets is from about 20 to about 300 times greater than the average thickness of the platelets. The fire resistant sheet further comprises an inorganic support scrim, where the inorganic support scrim is comprised of glass fibers. The fire resistant sheet is a paper comprising polymer fibrids that do not melt at temperatures below 280 degrees C. The fire resistant paper comprises meta-aramid fibrids and at least 50% by weight of crystallized mineral silicate platelets based on the weight of the fire resistant sheet. The crystallized mineral silicate platelets are mica particles, and where the fire resistant paper further comprises a meta-aramid floc. The polymer fibrids of the fire resistant polymeric sheet further comprise an organic flame retardant selected from phosphorus-based flame retardants, phosphorus and halogen-based flame retardants, chlorine-based flame retardants, bromine-based flame retardants and combinations. The polymer fibrids of the fire resistant polymeric sheet further comprise an inorganic flame retardant selected from aluminum hydroxide, magnesium hydroxide, zinc borate, antimony-based flame retardants, guanidine-based flame retardants, zirconium-based flame retardants, and combinations. The fire resistant sheet has an average thickness of at least 100 microns. The fluoropolymer film is a film consisting essentially of fluoropolymer selected from polyvinylfluoride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene-tetrafluoroethylene and combinations. The fire resistant sheet has two opposite sides, the first side of which is adhered to the fluoropolymer film, and the second side of which is adhered to a second polymeric film. The second polymeric film is a film selected from fluoropolymer films and polyester films.