Abstract:The mass loss, emitted gas composition and structure change of rigid polyurethane foam (PUR foam) at different temperature were investigated, and the amount of released blowing agent, CFC-11 (CCl3F) was determined when PUR foam was heated. The release rate of CFC-11 increased with the rise of temperature when the temperature was in range of 80~160℃. At 160℃, particles of PUR foam were not decomposed and the CFC-11 that was adsorbing or wrapping in PUR foam was removed at the highest speed. Foam particles which were through 4mm sieve were heated to 160℃ for 1h, 2h and 4h, respetively, then the corresponding 84.5%, 95.5% and 96.6% amount of CFC-11 in the foam particles was removed, respectively. It took a long time to completely remove the residual CFC-11. The amount of releasing CFC-11 accounted for 82%~85% of the total heating release gas.