According to the following 3 factors, not excellent Tin exports in developed countries.
1) if quality is not good of Tin, into an empty tank, there will be a lot of Tin ion solubility of iron into the food and quality of decline. When severe, even destroy all food;
2) tinplate packaging are high-tech products;
3) tinplate is a valuable capital and strategic capital, developed countries are not export it, and difficult to obtain from other countries.
According to the beauty of tinplate packaging designers found that specifications tinplate and processing in the United States, has been drawn up by the Ministry of defence and the purposes. Tinplate quality specifications 4 standard in the us, in which the Tin is necessary to reach the 5 quality indicators, restrictions are imposed, which is unique in the world.