The pyrolytic decomposition of Owens-Illinois resin GR650, an organosilicon compound.

The pyrolytic conversion of an organosilsequioxane (Owens-Illinois resin GR650) to SiO2 is characterized by ir spectroscopy, thermogravimetry and evolved gas analysis (line-of-sight mass spectroscopy). Scanning calorimetry, ramping at 10C/min, on the as-received (room temperature annealed) resin indicated a glass transition temperature of 67C which decreases to 58C for an unrelaxed sample. The ir spectra have bands which can be assigned to Si-CH3 and Si-O-Si modes.