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BeerTools Discussion Forum • View topic - Yeast starters and size of Erlenmeyer Flask

Yeast starters and size of Erlenmeyer Flask

Physics, chemistry and biology of brewing. The causes and the effects.

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Yeast starters and size of Erlenmeyer Flask

Postby river water brewing » Tue May 11, 2010 4:37 pm

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No problem

Postby brewmeisterintng » Tue May 11, 2010 6:54 pm

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Re: Yeast starters and size of Erlenmeyer Flask

Postby slothrob » Tue May 11, 2010 7:41 pm

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thanks!!

Postby river water brewing » Fri May 14, 2010 6:18 pm

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erlenmeyers

Postby slothrob » Sat May 15, 2010 9:20 am

The lore in the lab has always been that Pyrex® by Corning were the best, but I don't know that I've seen evidence to support that, and I've certainly broken Pyrex ones.

I think the secret is even heat and gradual cooling. I use a heated stir-plate that's designed for this, but if I was using an electric stove I'd use a . I've heard of people heating their flask on a cast-iron pan, which might accomplish the same thing. After that I never plunge the hot flask directly into ice water. I also allow it to cool for a while in the air before putting it into cold water to finish cooling.
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Postby conman » Sat May 15, 2010 9:48 am

I would either buy a heated dtirplate or stay away from direct heating of your flasks.
boiling in a nice shiny stainless boiler and transferring to a flask is probably the simplist and safest practice that will accomplish everything you need without risking your flask(s) JMO.
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Postby Bob57702 » Sat May 15, 2010 10:44 am

I had a flask (6l) break directly due to the concentrated heating of the element of an electric stove. I've since replaced the flask and the stove. The stove is still electric but now it's a glass top. No problems since. I've never had a problem with putting the hot flask into an ice bath. Of course this is lab glass and it's intended for this type of use.

Now here's a question; If you're using DME and RO water, possibly with nutrients, is there a real reason to boil? I've recently stopped the boiling practice and have had equally good results without the issues of boiling.

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