A composite sheet material comprises a porous core layer adjacent to a skin layer. The porous core layer comprises a thermoplastic material and 20 to 80 weight percent (wt %) fibers based on a total weight of the porous core layer. The thermoplastic material comprises poly(arylene ether) and an additive comprising a flame retardant, a smoke emission retardant, a flame and smoke emission retardant or a combination of two or more of the foregoing retardants, wherein the additive is free of chlorine and bromine. The thermoplastic material may optionally comprise a viscosity modifier. The skin layer covers at least a portion of a surface of the porous core layer.