● The question isn't about burning HDPE but melting it at the proper temperature. (At 120 to 180°C depending on it's density, it becomes gooey. According to the source below the "extrusion" temperature range of HDPE is 176 to 260°C ― at 260°C, I guess it becomes a very viscous liquid).
Is it perfectly safe (eg: indoor melting, in a kitchen oven). Or does it produce toxic fumes ― before 180°C? Before 260°C? If so which one?
● And what about melting it canola oil? (This technic seems more energy efficient, and easier to control the temperature).
This experimenter tried with Canola oil, which has a smoke point of over 204 °C. He melted the HDPE in the oil at 176°C (the output needs to form a block and expresses the oil).
Is it safer to melt HDPE in oil ?
○ Bonus: does the Canola oil degrade the HDE? (The experimenter found out that the oil "gets really thick when cool" and he thinks it's because some HDPE dissolves on it. Someone comment "The canola oil probably acts like that because some of the HDPE is converted into paraffin wax which is soluble in canola oil. HDPE isn't lipid soluble".
Any information on the topic is welcome
It's not a duplicated:
This question has been asked about specifically melting empty silicone tubes (made of HDPE). It's off topic since not about HDPE only (it's a complex issue since there are many different types of silicone on the market)