Would be surprised if LDPE is the more shatter prone. Why would lower density be more brittle, surely it'd be even softer and more malleable than a high density variant?
Those chopping boards you used on Tormenta 1 were LDPE, need I say more? ;-) LDPE has shorter polymer chains and as a result breaks more easily as there are less crosses and linkages. (I hope I remembered that right)
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