For more than 100 years, IWACHU has been the largest producer of cast iron teapots and kitchenware in Japan. Teapots are made by pouring 1500cc of hot liquid iron into the mould which is then left to cool and harden. They are then released from the mould and are individually smoothed by a sander to remove any rough edges. The inside is then coated before being painted on the outside. Each piece is individually inspected before it is allowed to leave the factory to ensure it is of the highest quality.