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respirometer. This composting system complies with the ASTM D-5338 (latest edition) and  equivalent to the ISO 14855. The method is similar to the one used by Anne Calmon and Thitisilp  Kijchavengkul [2, 9]. The whole process is performed at a regulated composting temperature and  humidity of 58{\textdegree}C (±2{\textdegree}C) ($ \pm $2{\textdegree}C)  and above 50\% respectively.   The PU polymer samples, were introduced into the Compost Unit, then the following sets  (3 samples each) were prepared to complete the required process, each one containing 200g per