Pyrex And Gas Stove

[Sprungmonkey]

Does anyone know if pyrex can be heated on a gas stove. ie will it break - I want to heat up wort in an Erlenmeyer to make a starter

 

[Jez]

Hi,

I've got a Schott Duran 2 Litre Erlenmeyer flask that I regularly use to boil my starter wort on the gas stove then crash cool in the sink with no probs.

I think it depends on the brand of your flask. Some of the cheaper, chinese-made ones I think tend to crack with the change in temp.

What brand flask do you have?

Jez

 

[Sprungmonkey]

Pyrex

 

[kevnlis]

My brand new 2L Pyrex Erlenmeyer Flask cracked the first time I heated wort in it on my stove. I used a gentle heat and swirled the liquid like I usually do with the smaller flasks. It just went BANG and a big crack apeared in the bottom and liquid started seeping out. I swore heaps and chucked it in the bin.

 

[ausdb]

I have numerous Kimax branded pyrex erlenmeyers that get used on a gas cooktop all the time. When I use them I don't turn the gas on full bore until they have warmed up a bit so as to not thermal shock them too much.

 

[justsomeguy]

Flasks made from borosilicate glass should be fine. You can even boil wort in one and immediately put it into a water bath to chill it. Something about borosilicate expansion factor, I think, that allows you to do this.

Most 'normal' glass would simply shatter so make sure you know what sort of glass your flasks are made from.

I've got a 2litre one made in the Czech republic that I got from Grain and Grape that works wonders.

gary

 

[Sammus]

Weird... Pyrex is the brand name borosilicate. I got the cheapest flasks I could find on ebay and always use them on the stove successfully...

Maybe I'm just magical with glass...once I actually tried to temp shock shatter an empty beer bottle by sticking it in the freezer overnight, took it out and immediately filled it with boiling water... didnt even crack lol.

 

[Sprungmonkey]

I have used them for heating on electric before and had no issues, just was wondering if there would be any difference with gas.

 

[Franko]

I use my flasks on gas no probs thats what there made to do

Franko

 

[Sprungmonkey]

shall let you know in a few days when i give it a go.

 

[Aaron]

This may be of interest to Pyrex users:

"Pyrex is a brand name for glassware, introduced by Corning Incorporated in 1915. Originally, Pyrex was made from thermal shock resistant borosilicate glass. Since 1998, when Corning spun off its kitchenware division as World Kitchen, Pyrex branded kitchen glassware has been made of soda-lime glass.[1] However, Pyrex brand laboratory glassware is still made of borosilicate glass."

Ripped from http://en.wikipedia.org/wiki/Pyrex.

These following articles may also be of use. I guess you can't direct heat any recent pyrex kitchenware.

http://en.wikipedia.org/wiki/Soda-lime_glass
http://en.wikipedia.org/wiki/Borosilicate_glass

Looks like someone discovered the difference in this thread:

http://www.aussiehomebrewer.com/forum/inde...c=8774&st=0

 

[albrews]

Does anyone know if pyrex can be heated on a gas stove. ie will it break - I want to heat up wort in an Erlenmeyer to make a starter
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hi, maybe a heat diffuser pad will help over the gas flame. they are in supermarkets and inexpensive to give it a go.

cheers

 

[braufrau]

Does anyone know if pyrex can be heated on a gas stove. ie will it break - I want to heat up wort in an Erlenmeyer to make a starter

Isn't that just the same as pyrex on a bunsen burner? Chemists usually use a wire mat when they do that, but other than that its the same!

 

[Sprungmonkey]

thanks all -- It worked with no issues (didn't use a gauze mat)

 

[samhighley]

Pyrex jugs sold at the supermarket have 'not for stove top use' printed on them.