Hello, are you asking if the coating of sandwich machine is toxic? Sandwich machine coating is toxic. Sandwich machines are usually made of non-stick coating materials, which are usually polytetrafluoroethylene (PTFE) or other similar chemicals. After normal use, the non-stick coating is relatively safe in health and safety. However, if the non-stick coating is overheated or damaged, it will release harmful substances. When non-stick coating is used to fry or heat food, too high temperature will lead to the decomposition of the coating, producing gas and steam, some of which are considered toxic.