So @Eclsnowman was sharing pictures of his new beast of a CNC router on Twitter (maybe we could get him to share some here as well )
And he was worried about some cheap plastic fittings that might not hold up for his water cooled spindle when using antifreeze.
So he called on the chemistry wizard yours truly
This is the thread of my answer.
Here is the table of what the PDL number means (higher is better)
So long story short, most plastics, includging PETG, will most likely be compatible with glycol based antifreeze. PG based antifreeze may or may not be better then EG ones, but I have no reason to suspect it would be worse. No guarantees, but that’s the indication of the available information.
To be on the safe side I would do visual checks at least every 6 mo to verify there is no significant color change or part swelling.
Also sorry not sorry for the dramatic clickbait title.