GLASS CERAMICS.Characterization of the thermal decomposition of polyurethane (PUR) foams was performed by Fourier-transformed infrared (FT-IR) spectroscopy and thermogravimetric analysis (TGA).Three main weight loss paths were observed by TGA, the residue being lower than 3 wt.%for 3 different PUR foams analyzed.FT-IR spectra indicated CO 2 , CO, NH 3 and isocyanides as main decomposition products.PUR foams of different cell sizes were immersed in a slurry of the parent glass ceramic of composition Li 2 O-ZrO 2 -SiO 2 -Al 2 O 3 (LZSA) and submitted to heat treatment.The LZSA cellular glass ceramics obtained after sintering and crystallization resembled the original morphology of the PUR foams.