e and Tin Free Steel ProductFeaturesTinplateTFS2.8Over 5.6Bare Corrosion Resistance (sealed) (1)Rust Resistance○◎○Acid Resistance○○△Alkali Resistance△△◎Black Sulfide Stain Resistance△△◎Stress Cracking Resistance◎◎○Paintability○○◎Corrosion Resistance after Painting (2)◎◎○Filiform Corrosion Resistance◎◎◎Paint Adhesion○○◎Formabity◎◎○Solderability○◎XWeldability○○△ (3)Heat Resistance (4)○○◎Note: ◎: excellent ○: good △: fair X: poor1. Bare corrosion resistance