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The plastic bottles have wide using as one of the most used custom packing materials in market. They are used mainly by food industry also by chemical industry. This paper deals about the analysis of changes of mechanical properties changed by influence of temperature of selected PET bottles as incoming plastic waste. This material was tested in two temperature conditions. First was low temperature for simulating the cold weather in winter and the second one was the high temperature simulating the hot weather in summer. To find out the changed mechanical properties of PET bottles was made the tensile test where were defined certain parameters. Achieved values of selected mechanical properties - yield strength, tensile strength and relative elongation were compared with the measured values in natural environment. To comparing the material composition of both materials was made the Raman spectroscopy [ABSTRACT FROM AUTHOR]