A fire retardant slotwall panel material having multiple slots forming multiple slats on which brackets and other devices can be mounted. The composition of the material for extruding the slotwall panels comprises CPVC, PVC and a fire retardant so that the resulting product will meet at least one of the ASTM E84-01 and UL 723 fire retardant standards. The composition can comprise 60-100 PHR of CPVC, 40-0 PHR of PVC and 20-50 PHR of fire retardant that can be AL Trihydrate. The composition of the material can include other ingredients such as: 2.7-3.3 PHR Zeolite, 0.36-0.44 PHR Blowing Agent, 9-11 PHR Process Aid, 2.475-2.525 PHR Tin Stabilizer, 0.9-1.1 PHR Exter Wax, 0.9-1.1 PHR OPE Wax, 2.7-3.3 PHR Impact Modifier, and 2.7-3.3 PHR TiO.sub.2.