The best brewers make large yeast starters to get their beer fermenting fast. Large populations of active yeast help ensure flavorful beer free of off flavors.Erlenmeyer flasks are made from borosilicate so you can move directly from gas stove top to ice bath for cooling without it cracking. This reduces the risk of contamination when transferring from one container to another.
Note: It is not recommended to use directly on electric heating element. Only use gas.