Its English name "Tinplate" is a combination of "tin" and "plate", which explains the core component of this material: a tin-plated steel plate. Tinplate is mainly composed of two raw materials: low-carbon steel plate and tin coating, which complement each other and give tinplate superior performance.

The coating process is a key link in the production of tinplate cans. Whether it is the inner coating or the outer coating, it must be ensured to be uniform, complete and crack-free. If there are any defects in the coating, the metal may be directly exposed, increasing the risk of food contamination.

Food packaging cans have very strict requirements on materials, especially their corrosion resistance and food contact safety. Acidic or alkaline components in food may cause corrosion to the metal surface, while the surface of tinplate after electrolytic treatment has stronger chemical corrosion resistance, which can effectively prevent direct contact between food and metal.

A well-sealed can can effectively isolate oxygen and moisture, preventing biscuits from oxidation and deterioration and moisture absorption and deliquescence. According to relevant research data, if stored in a dry, sealed tinplate can, the shelf life of biscuits can be extended to 12 months or even longer.

For example, the packaging of acidic food cans such as jam and ketchup often requires thicker tinplate to resist the erosion of acidic components. Generally speaking, the thickness of tinplate for such food packaging cans is about 0.20 mm to 0.30 mm.