All of our flasks are made from borosilicate type glass which is nice because they can be transferred directly from heat to ice and not crack like normal glass. (We do not recommend the use of an electric element. If this cannot be avoided, we recommend using a larger pot as a hot water bath on the stove.)
Great Flask for yeast culturing.
Recommended Process for Use of Flask: Double Boiler Method
We recommend using the "double boiler method." This process involves using a boiling water bath on the outside of the flask to heat up the water inside the flask. This process is much safer and efficient. If the flask should break or boil over, your kettle will be there to collect the contents, thus keeping your stove clean and keeping you away from potential harm.