50pcs Black PE plastic welding rods. Single length: 12.5in; Total Length: 52Ft. High-wear resistance,High-inadhesion resistance,Low temperature resistance. Non-toxic and clean property,good self-lubrication. Apply to most plastic welding like PE, HDPE, LDPE and other plastic.
I welded my HDPE box to it (and a few screws). I also used them to hold some metal screws in place so I could easily screw in the screws/bolts every time I closed the box. He was NOT trying to be perfectly white. I don't know if I burned it or what but it definitely didn't turn black or anything haha.
Pros
High wear resistance, High adhesive strength, Low temperature resistance