The Catalyst’s tank is made from Tritan®, a medical-grade, BPA-free, polymer. This food-safe polymer is the highest quality material ever used in a fermenter, providing the clarity of glass with the durability and convenience of plastic. This material acts as an excellent barrier against oxygen, makes our tank 93% more scratch-resistant than other plastic fermenters and is even dishwasher safe, withstanding temperatures of up to 230º Fahrenheit.