1) Opacity: Light will not only cause food deterioration, but also cause changes in food quality and grade. Tea (especially green tea) is more prone to deterioration under light. The opacity of tinplate can makes the preservation rate of tea the highest, and retains the original juice, color, taste and fragrance of tea.

2) Good sealing: The barrier of packaging containers to air and other volatile gases is very important for preserving nutrition and sensory quality. Metal cans with low oxygen permeability can better protect tea, which is also the best feature of iron cans.

3) Reduce tin: Tin in the inner wall of tinplate will react with the residual oxygen in the container during filling, reducing the chance of oxidation of food components. The reduction of tin also prolongs the storage life of tea.

In addition, the tinplate can also has the function of heat insulation, which completely isolates the influence of environmental factors, avoids the discoloration of food due to light, oxygen and moisture, does not fade due to aroma overflow, and does not change the taste due to environmental odor pollution, so the stability of food storage is better than other packaging materials.