A number of authors (Ong and Bair, 1979; Sherman et al., 1982; Pryde, 1984) have studied the effect that produces the UV radiation on the PC. However, they have mainly focused on the mechanism of photo-degradation and in superficial changes as, for example, the acquisition of a yellow colour. In this work, the effects on the mechanical and thermal properties of combined conventional extrusion or injection processing and UV accelerated ageing on a conventional PC were investigated. These studies are referred to the samples reprocessed by injection corresponding to one and five cycles. In agreement with the described procedure, the samples were maintained in the QUV chamber during 600 h for both the first and fifth reprocessing cycle. In both cases, samples were mea- sured at intermediate times to evaluate the influence of the ageing time in the properties of the material.