bgough

Recipes 

can I just put it straight into an ice bath or will this crack it?

menschmaschine

Recipes 

It's unlikely that it will crack, but not impossible. I prefer to put it in regular cold water first, then an ice bath just to be safe.

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Zen_Brew

Recipes 

They are supposed to be able to take the shock of going into the ice bath hot. Just because it makes me nervous I usually go into a room temp to warm bath first for a couple minutes, then drain the water, add cool tap water and start adding ice. It may not be necessary, but it makes me feel better.

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z987k

Recipes 

make sure it's actually tempered glass. Just because the shape is correct doesn't mean the glass is. I know of a lhbs near me that sells them and the glass in just regular glass.
Pyrex or tempered should be on the flask somewhere.

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Brewin_CRAZY

Recipes 

Id just throw it in the fridge or freezer and wait a little while. Then you just have to worry about convection, no conduction to shatter your wonderful glassware.

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nostalgia

Recipes 

Or "borosilicate".

I do as the other posters said - go to tap water first, then ice water.

-Joe

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passedpawn

Recipes 

Unfornately, Pyrex doesn't mean anything anymore. Either look for the word borosilicate on the flask, or assume nothing about its ability to survive thermal shock. This changed in 1998 with the sale of the brand. More Here.

z987k

Recipes 

at least it's still tempered. I did not know that they switched though.

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Beer Style Guidelines - Kaiser's Brewing Experiments - American Society of Brewing Chemists - Journal of the Institute of Brewing

Chupacabras

Recipes 

"Pyrex laboratory glassware is also still made of borosilicate glass."

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Homercidal

Recipes 

Wow. I have been lucky. I better check mine. I just assumed it was Pyrex. I've been putting boiling wort in mine for starters and then adding ice water around it to cool.