(ETP) and tin free steel (TFS) products, which are imporant raw materials for manufacturing cans. Cans that are made of tin mill products are easy to ship, stack and store and are widely used for packaging of consumer goods and industrial goods.2. Product Parameter (Specification)Most people believe that an ETP is composed of five layers, including base steel, iron-tin alloy, tin, passivation film and oil film. However, some people believe that it is made up of six layers; that is, there is a ti