Ideal for medium yeast starters using stir plates. Propagating yeast can take your beer to the next level, ensuring flavourful characters from the yeast. Instead of stressed out flavours that can occur when under pitching.
If you are fermenting a lager we highly recommend doing large yeast starters to ensure the tastiness of your brew.
If you're wanting to heat up your DME for a yeast starter, this flask is perfect! So if you're into whacky science experiments or simply just want to make large yeast starters, this is your best bet.
We recommend using only a gas stove top, not your electric stoves.
**Please still exercise care when handling these and any other Borosilicate glass.**
There is a common misconception that Borosilicate glass is virtually bulletproof and can handle any dramatic temperature that is thrown at it. This is not strictly true.
Though it does have an incredible ability to withstand sudden and drastic temperature shocks compared to your average soda-lime glass, it should still be treated consciously with care.
Cool all glassware slowly to prevent breakage, unless you are using VYCOR glassware which can go from high heat to ice water with no damage.
Do not take your boiled flask directly from the stovetop straight into a bath of ice water. Though some people do this without failure, borosilicate glass is not designed for such an application. Please allow the flask to cool for a few minutes before running under water, before placing into an ice bath; the slower you introduce your flasks to temperature changes, the longer it will last. Going from fire to ice in a matter of seconds will introduce incredible amounts of stress to the glass structure. While the glass may be able to withstand this some of the time, other times you may not be so lucky. If the temperature differential is big enough, it will shatter. All Borosilicate glass will break eventually after a number of heat/cool cycles, it is impossible to give an exact number to determine when, but this is a natural an inherent feature of the material.
Please do not boil your flasks dry or dry them out using a stove. The temperature for drying should not exceed 140°C, which a naked flame can easily exceed.
Do not heat glassware that is etched, cracked, chipped, nicked, or scratched. It is more prone to break.
Do not heat glassware directly on electrical heating elements. Excessive stress will be induced in the glass, and this can result in breakage.
Small Bubbles that are less than 5mm and not located directly on the bottom of the flask is an acceptable manufacturing blemish.