In this research, I have discovered the following:
"... Many shoe manufacturers have since the 80s will include shoe soles made of polyurethane (PUR) are processed (these are the soft lighting, thick, which are attached frequently also in Sports shoes. But the look fixed externally beautiful, eg expensive hiking boots, usually have a soft PU core). For some time I but already noticeable that these soles start after a short time to dissolve and then disintegrate literally, although the upper of the shoe still would allow a longer gestation period. The removal of this damage by Repair is usually impossible because attaching the completely new shoe sole specialist machinery requires. that the plastic polyurethane shows this disintegration and does not last forever is a property of this material per se, but I had already 20 years old shoes with PU sole for repair, at where the sole was still intact. So is also here to suggest that the manufacturer specifically affect the properties of this plastic and installing a breaking point boost to the shoe sale ... "
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