Item #: T47
Our Price: $39.99
In Stock, Will Ship On 01/27/2020.


If you make yeast starters, our heat-resistant glass Erlenmeyer flasks are perfect for preparing the starter solution and growing the yeast. Put the bottle directly on your stove to boil and then cool (with the bottle sealed with a foam stopper) before adding yeast to minimize the chance of infection. Withstands temperatures of over 700 F.

 This large 5000 mL bottle is 15" tall, and 9.5" wide at the base.  Use our Foam Stopper (item Q02) as an airlock to seal while making yeast starters.

NOTE: These are general laboratory studen grade made in China, and may have small bubbles in the glass or other imperfections that will not affect use.

A gas stove is recommended, as electric burners can cause the glass to crack.


Average Rating:
(based on 4 reviews)

Showing 4 Reviews:

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by Matt Katakura
on 1/3/2019
from HI
Worked until it broke
Worked well, only used gas stove to heat, maybe shouldn't have for the size. The neck separated from the rest about 3 inches from the top.  good thing it broke the way it did(mysteriously).  China made. Probably the only thing that ever broke or I was unhappy with from Williams as this flask actually lasted a good amount of times with numerous uses both homebrew and pro.  Be careful heating. Unless this brand has changed. The one made in Guengdong I suggest sanitizing and adding chilled solutions to. 
by Joe Theobald
on 10/15/2018
from OH
scuffed and stained
I received 2 of these items.  1 has scuffs on the inside around the neck, the other has a dark brown stain on the inside glass near the bottom.  They appear to have been used.  

We do not sell used products, although our flasks are 'student grade' which means they can have small imperfections. We have contacted you and have asked you what you want us to do to fix this. Thanks for your business!
by Geoffrey
on 1/25/2014
from Columbus
Perfect for harvesting
I use this along with my stir plate to make enough yeast for a 10 gallon batch and enough for yeast harvesting. I find this much easier than doing separate starters in my 2000 ml flasks (plus I only have 1 stir plate). I've started putting some leftover hops in my 4-5L starters and then bottling them as a light beer--great for the wife and you don't have to waste a gallon of beer! 
by Jake
on 9/6/2011
from Portland
Great for large batches.
This flask is comically large. However it is fantastic for making large yeast starter for 10+ gallon batches. The only problem is that is tough to find a stir plate that can adequately accommodate the flasks base diameter  at a reasonable price.
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