Cut up milk bottles into 1 cm strips, then across into 5 cm lengths. Put in a silicone loaf tin, and melt in oven at ~ 180 degrees.
The HDPE will not melt into liquid form, but will go sort of gummy. It could be pushed into a mould under pressure, or extruded.
THIS IS SO COOL, can't believe you actually did the process! :O
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