First run on my BVV Mk-5 today and the sight glasses completely cracked. Thinking it’s due to cold temps - had some acetone boil over from the dewaxing column when adding solvent which wasn’t cold enough and it splashed the sight glass. Not sure if that’s to be expected - I wouldn’t imagine so seeing as the collection vessel is submerged in a dry ice slurry but perhaps I’m wrong?
Yeah the sightglass is 100% polycarb by their description. I’d link you it but I can’t share links yet. I’m looking at the borosilicate sights are a replacement but just wanted to come by here to get an opinion.
I feel pretty strongly in system marketed as passive that all components should be safe for use with dry ice temperatures. I guess I kind of just want to see if that’s a valid feeling or not.
Learned some chemistry today in examining this failure. Acetone and polycarbonate are enemies. Acetone will significantly weaken the structural integrity of polycarbonate, so when it hit the poly it immediately caused it to lose its integrity. I’m trying to determine whether or not the slurry is worth all the mess and hassle - could anyone share their thoughts on the matter? Sucks because I just bought $160 worth of acetone, but it causes over half the dry ice to boil off when I add it to the slurry for the spool, and this spewing problem from the dewaxing column sucked balls.
Almost positive it’s borosilicate. It’s the most expensive option they sell, and the price difference between the two and even the metaglass is so negligible. I don’t want to get into the details of it but from the cheapest option to metaglass is like $15. I don’t understand why companies would cheap out on this. I’ve used acetone for years without cracking a sightglass and never to this day have heard someone cracking one.
I will say this is the 3rd or so sightglass cracked like that. All of which are clamped on like the OP
I had those on my collection pot and dewax column from bvv they all cracked, I upgraded to the borosilicate ones and haven’t had any issues since, they have a metal ring that contacts the clamp so that they dont crack, and they dont scratch up either…
Ugh. Maybe I will make the switch. Just sucks to have learned this the hard way. Know any uses for 8 gallons of acetone? I guess giving my girlfriend enough nail polish remover for the rest of her life .