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Old 03-24-2011, 02:46 AM   #1
stephelton
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Oct 2008
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I had a 5000 ml erlynmeyer flask that I ordered from Rebel brewer. It worked well one time around, then I began heating it for a second time and it broke. There is a large (4 inch diameter or so) hole near the bottom. Fortunately, it was only water that I was heating.

I'm wondering how to prevent this in the future. I was heating on this guy:

http://www.academy.com/images/produc...37-0001-P1.jpg
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Old 03-24-2011, 02:50 AM   #2
bbognerks
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Don't immediately put it on full heat. Let it warm up a bit on low, then raise the flame intensity. Just a thought.

 
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Old 03-24-2011, 02:51 AM   #3
ACbrewer
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are you sure that the flask is heat resistant? And even if it is, how fast can it change? I would think that a rapid temp change would cause it to crack and shatter. Untreated glass typically does that.

 
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Old 03-24-2011, 02:56 AM   #4
stephelton
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It was boiling several minutes before it cracked, so i don't think it was temperature change that killed it.
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Old 03-24-2011, 03:00 AM   #5
bbognerks
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Well the 5L flask on rebel says is borosilicate and can be heated on gas stove. I had a 2L borosilicate flask crack on me for no apparent reason as well. I chocked it up to heating it too fast. Now I just make the wort and cool it. Then pour it in the flask.

 
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Old 03-24-2011, 03:02 AM   #6
Rushis
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Maybe a burner that's throwing less than 50,000 BTU's?

A heat diffuser could help in the future. A cast iron griddle big enough to accommodate the flask would do the trick.

 
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Old 03-24-2011, 03:12 AM   #7
Scut_Monkey
 
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I would imagine that burner is just too overkill for the glass. I can't imagine it not being borosilicate glass but it still has it's limits.

Quote:
Originally Posted by bbognerks View Post
Now I just make the wort and cool it. Then pour it in the flask.
What is the point of using a flask then? You could simply use a jar or something cheaper than a flask. The whole idea behind the flask is that you are sanitizing it while you boil and sanitize the wort. This becomes even more important when working with small quantities of yeast.

If you are worried about the integrity of the glass you are using simply heat it up like a double boiler. Fill a pot big enough to hold the flask with some room temp water. Place the flask with unboiled wort into the pot and water. Heat the entire thing on the stove. As others suggested you could also use a heat diffuser if you want to use direct heat.

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Old 03-24-2011, 03:25 AM   #8
bbognerks
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Well considering it was replaced for free, then why wouldn't I? It's not like I went out and bought another one. Besides that, most jars/jugs have a highly curved bottom which won't allow me to use a stir plate...

 
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Old 03-24-2011, 03:30 AM   #9
Scut_Monkey
 
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Quote:
Originally Posted by bbognerks View Post
Well considering it was replaced for free, then why wouldn't I? It's not like I went out and bought another one. Besides that, most jars/jugs have a highly curved bottom which won't allow me to use a stir plate...
I see, it's a replacement you are using. There are just relatively easy ways to prevent them from breaking. I simply don't want to do more dishes so I like to boil within the flask. Most importantly it reduces the risk of infection.

 
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Old 03-24-2011, 03:34 AM   #10
bbognerks
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I don't necessarily have to do more dishes. Just throw a jar in the dishwasher after emptying it... I never said I make the wort every time

 
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