melting treatment of electro-tinned raw material strip with rough matt surface.E. Silver rough surface (S2) - Glazed surface obtained after melting treatment of electro-tinned raw material strip with rough matt surface, roughness higher than "S".F. Matte surface (M) - Matt surface of general matt raw material strip without reflowing treatment.4. How many types of tin coat weight of ETP?There are two types of tin coat weight. One is Equally Coated, inside and outside tin coat weight is same, like