POLIETILENO (PE)
http://www.youtube.com/watch?v=OoBRKX8-euk&feature=fvsr
http://www.youtube.com/watch?v=BSH3uPJm1l8
POLIBUTILENO (PB)
http://www.youtube.com/watch?v=j3DfVoPjpWw
http://www.youtube.com/watch?v=6emk4udeMvU
http://www.youtube.com/watch?v=ndr5W8pUJLU
MULTICAPA:
http://www.youtube.com/watch?v=Wlw40rl0-MI
http://www.youtube.com/watch?v=uVbXdwWIO08
http://www.youtube.com/watch?v=MqJzwiLGprU
POLIPROPILENO (PP):
http://www.youtube.com/watch?v=mD93__cPV2M
http://www.youtube.com/watch?v=UERQZt-Fihk
http://www.youtube.com/watch?v=aq6vbi0nULg&NR=1
