Custom Printed Electrolytic Tin Plate Coils for Tomato & Harissa Can Packaging Solutions Electrolytic Tin Plate (ETP) is a high-quality, cold-rolled low-carbon steel sheet or coil electrolytically coated with pure tin on both sides. This process ensures exceptional corrosion resistance, formability, and food safety, making it an ideal material for packaging acidic and alkaline food products like tomatoes and harissa. Our custom-printed tinplate coils combine functionality