permo
Well-Known Member
I just bought a 4000 ML Pyrex flask for my yeast propogating ventures. I have the stir plate and all. Now I am wondering if I dare move this thing directly from the stovetop to an ice bath or if it will crack?
johnsma22 said:The thing about boro-silicate glass is that it's perfect right up until the moment it's not! It can take thermal shocks right up until the moment it can't! It can be used directly on a ceramic cooktop without any issues right up to the point that it shatters and spills 4000ml of hot sticky wort all over your stove and kitchen. Don't ask me how I know!
Suffice it to say that I still use my flasks for fermenting the starter on my stir plate, but I no longer use them on the stove. I boil the starter wort in a pan, chill it and then pour it into a sanitized flask with a sanitized stir bar already in there and then add the yeast.
SixFoFalcon said:So why are you guys bothering to pay extra money for borosilicate?
So why are you guys bothering to pay extra money for borosilicate?
The other thing a lot of people overlook is that if you're boiling in the flask and you keep it covered (foil, foam stopper, airlock, whatever) you really don't need to chill it at all. You can just leave it sitting out until it's cool enough to pitch into. It's not like you have 5+ gallons sitting in a pot with a large opening where nasties can get in and you're racing against the clock.
Suffice it to say that I still use my flasks for fermenting the starter on my stir plate, but I no longer use them on the stove. I boil the starter wort in a pan, chill it and then pour it into a sanitized flask with a sanitized stir bar already in there and then add the yeast.
So why are you guys bothering to pay extra money for borosilicate?
FarmerTed said:Pyrex isn't necessarily borosilicate glass anymore. It's just a trademark that was sold by Corning 20 or so years ago. I'd be weary about shock-cooling a flask, unless it was made by someplace like chemglass.
that's just because they don't want you cooking meth with it. lousy culinary industry...My 4 cup Pyrex measuring cup says specifically "Not for Lab Use."
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