Domo Chemicals has opened a refinery in Gorzów Wielkopolski, Poland, to recycle air bags used in cars. This is difficult for a number of reasons: firstly, the bag contains a silicone rubber coating in addition to polyamide, so the materials have to be separated, and secondly, silicone rubber is cross-linked, so it cannot be processed in a slurry form. A further difficulty is that silicone rubber has a very low glass transition temperature (below -100 °C), so it is difficult to shred in a glassy (brittle) state.