Pure tin is non-toxic, depending on what kind of solder it is, the ordinary Sn63-Pb37 is undoubtedly toxic! Because it contains lead, although lead is difficult to be absorbed by the human body when it is solid, you don't have to run if it is differentiated into gas after heating. Protective measures can indeed be alleviated, but long-term is not the way. Some inferior and cheap solders contain more lead. For example, the futures price of tin is 170 yuan 1KG, and lead is only 20 yuan 1KG. Needless to say, what will those profiteers do? Many countries in Europe have banned lead solder. Anyway, we only have health and life to sell in China. Lead-free solders such as Sn99.3-Cu0.7, about 18 1 kg, contain dozens of pieces of lead, depending on what kind is used in your factory, I don't think your boss will use lead-free.