TLDR: DO NOT use PVC or PLASTIC - Use Metal/Glass.
DO NOT use PVC or PLASTIC pipes for blasting - I've seen tons of arguments below: PVC or PLASTIC tubes/pipes aren't meant to be in such extreme conditions, hot or cold. It degrades the plastic and leeches residues from the pipe into your resin. It can also be noted you don't HAVE to use Butane, you can also use oxygen or anything else that will strip the plant matter without degrading your resin. End of story.