fatherbigfoot

Recipes 

Well I really did it I just finished building my stir plate and was going to do my first starter on it so I measured out my DME added 2000ml to my 4000 ml Pyrex flask added a drop of de-foamer and my stir bar. I then put it on the electric stove top and commenced to boil. As the flask started to boil I looked a way for maybe 10 seconds and when I looked back the sucker was about to boil over. As I reached for a hot pad to pull it off the heat it really started to gush and then there was a sickening snap and 2000ml of boiling wort spilt all over the kitchen.

Crap now I guess it's back to using growlers for starters. And worse of all I can't use the growler on my new stir-plate

Yooper

Recipes 

Yes, you shouldn't use a pyrex flask on electric stoves unfortunately.

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Tonegroove

Recipes 

I concur. Electric gets crazy hot in an uneven way. Maybe some layer of buffer might work like a metal disc or small frying pan to make it less painful for the Pyrex.

mikescooling

Recipes 

They just did a thing on TV about how new pyrex can't take the heat of old pyrex. People take it out of the oven and set it on something cold, boom!

fatherbigfoot

Recipes 

Hmm when I was in grad school I used an electric stove on Pyrex. Well live and learn just wish I had not sacrificed my 4000ml flask

nmfree

Recipes 

It's because newer Pyrex cookware (I can't speak for labware) isn't actually borosilicate glass anymore but is actually regular soda glass that's been tempered. As the saying goes, it works in the kitchen... until it doesn't.

It seems to me that you can tell by looking at the glass itself; borosilicate has a bit of a brownish tinge to it while the soda glass has a green tint.

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Xpertskir

Recipes 

Place the flask in A large pot with water then put the pot on the electric stove.

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beermonster

Recipes 

Yikes, I always put my flask directly on the stove, now I'm worried!

Bobby_M

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Recipes 

I got my flask from a lab supply and it says borosilicate right on there. Pyrex is just a brand name for glass products that used to be made from borosilicate but just like bandaids, people got used to calling the glass itself "pyrex". Unfortunately, you don't really know what you're getting if you rely on this brand name.

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Golddiggie

Recipes 

I knew I had seen it listed to not use an electric stove with flasks...

From the William's Brewing site: "A gas stove is recommended, as electric burners can cause the glass to crack."

Flasks are designed for use with gas burners, such as those you find in labs. So it makes perfect sense (to me) that you should not use them on electric heating elements (to get to boil)...

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