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Old 04-30-2010, 01:44 AM   #1
jalgayer
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Just order a stirplate...and a 3000ml flask.

Am I able to use the Erlenmeyer flasks on a glass stove... then right into cold water?

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Old 04-30-2010, 01:49 AM   #2
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I do it no problem, but you could be better off in a SS stock pot. The heat transfer of Pyrex blows!!!! You'll be shocked how long it takes to boil, then how long it takes to cool. Another issue you WILL encounter is a volcano effect due to the shape of the flask.

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Old 04-30-2010, 06:46 AM   #3
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On gas you should will be fine. I have heard that people should never boil a flask on an electric stove. I'm not sure why.

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Old 04-30-2010, 07:45 AM   #4
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I do it all the time with a *gas* stove. What the hell's a glass stove?

But you should buy some foam control for this. It'll want to boil over constantly if you don't add a drop or two of foam control.

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Old 04-30-2010, 09:59 AM   #5
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A glass stove is exactly the same as a gas stove... Just spelled wrong.

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Old 04-30-2010, 10:17 AM   #6
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Quote:
Originally Posted by jalgayer View Post
A glass stove is exactly the same as a gas stove... Just spelled wrong.
Hahaha! Nice!

You'll be good then as long as you get some foam control. If you don't you'll be standing there the whole time blowing down the foam and sticking something in there to try to break the forming head, or you'll have a bunch of boil overs. Something about the cone shape makes it boil over way more easily than normal.
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Old 04-30-2010, 01:11 PM   #7
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The second mine reaches a boil I consider it done. I have a oven mitt and I will take it right off the heat and put in an 8 qt pot should I not get it off in time.

I heat my Pyrex flask on my electric ceramic top oven ALL the time. For whatever reason I'm still never comfortable with it.

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Old 04-30-2010, 03:15 PM   #8
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I have a glass top electric stove and will put a coat hanger between the stove top and flask. Electric stoves get super hot and my 5L flask was not cheap. Using an infrared gun to check the temp easily pegs it so it's over 500F.

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Old 04-30-2010, 03:28 PM   #9
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I have a 2500 ML Erlenmeyer. Use it on my gas stove all the time. A few drops of foam control helps. You can take it from the stove immediately into an ice bath. Except that I do not let the ice water get above the liquid level in the flask. I also, after removing the flask from the stove, slide (not drop) down the slide my stir bar. I experienced no big delays in the boil ( it's only a 15 minute boil anyway) or the cool down in the sink. I use a foam stopper, too.

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Old 04-30-2010, 03:54 PM   #10
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I assume he actually meant a "glass top" stove. I have one and I boil a flask on it regularly. I have heard that it is not a good idea, but no problems so far.
The volcano effect is the main deterrent because you have to watch the flask pretty carefully for when it starts to boil.

Edit: my bad. I didn't realize that the OP was the same as the person that made fun of his spelling. I guess he really did mean "gas"

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