0pastprimitive 6 years ago ReplyUpvoteI have recycled HDPE milk jugs at home. My process was to clean the milk jugs, let them dry overnight so absolutely no water was present. Than I cut them into small pieces by hand with scissors. I then heated some canola oil to about 350 degrees and monitored it vary carefully with a thermometer. I then fed it the plastic chips a bit at a time allowing them to turn clear.After I had melted enough ( about 12 or so gallon milk jugs) I would take the plastic out with a metal spoon and put it into a tin can coated with oil on the inside to prevent sticking. I would than take a smaller can to compress the plastic in the can to help it form to the shape of the can. Than I covered it with tin foil, put it in the oven at 350 degrees and over the course of 6-8 hours I slowly stepped the temperature down to the lowest setting on my oven which was like 170 deg F, took it out and let it cool the rest of the way. The slow cooling helps with preventing more air bubbles, and cracking.My result was a deformed 4" diameter, 5" tall cylinder that was riddled with impurities, and air bubbles. Which I then cut slices from of and turned in my metal lathe to make different dies for a cottage manufacturing process I still use in my business to this day. I was fortunate enough that the many imperfections did not lie in any spot that effected the dies. The melted plastic was not like thick syrup, but more like a soft clay. Even when I brought it up to 400 deg F in the oil. The oil prevents the plastic from oxidizing (burning). Anyway I thought this information may help you in deciding what to do with the recycled PET bottles. My only other comment is that the process is really messy, very dangerous from all the hot oil, melted napalm-like plastic, and obscenely long time spent monitoring the whole affair so it doesn't literally catch on fire and burn the house down. Not to mention there is a real risk of poisonous fumes depending on the type of plastic. Especially if it oxidizes, but even than some plastics such as, but not limited to PVC and vinyl. When they're melted or burned they put off fumes that can kill you and do other bad things. I was told HDPE would not put off any toxic fumes as long as it didn't oxidize by my brother, but he is no plastics expert. So I would take that with a grain, or maybe a handful of salt.I hope this helps. I found the process to take a lot of effort, and be very fulfilling on a certain level. But efficient, safe, or economical it was not. Also I did dabble with trying recycled PET bottles. I couldn't get the plastic to melt in a way that was workable the way I wanted it to be. Much more difficult than the HDPE milk jugs.Side note: HDPE shopping bags did not behave the same way in this process and were useless for me.