Is soldering iron poisonous?
Solder wire, a material used for soldering with an electric soldering iron, although its main component is tin, it also contains other metals. Mainly divided into leaded and lead-free (that is, environmentally friendly). With the promulgation of EU ROHS standards, more and more PCB soldering factories are now choosing lead-free and environmentally friendly solder wires, and lead solder wires are gradually being replaced. It is not environmentally friendly and cannot be exported. Lead-free solder paste, lead-free solder wire, and lead-free solder bar are the main products on the market at present.
To put it simply: because of the low melting point of commonly used solder, it contains about 60% lead and about 40% tin, so the solder itself is toxic. Most of the solders on the market are hollow and filled with rosin, so the gas you mentioned is probably volatilized when the rosin in the solder melts during welding. The gas volatilized from rosin is also slightly toxic, and this gas is quite unpleasant.
The main hazard factor of soldering is lead fume, even if it is lead-free solder, it contains a certain amount of lead. The limit value of lead fume in GBZ2-2002 is very low, and the toxicity is very high, so it needs to be protected. Due to the damage to the human body and the environment during the welding process, in Europe, the protection of welding workers and the protection of the environment have been enforced in the form of legislation, and welding without some protective measures is not allowed. In the ISO14000 standard, there are clear regulations on the treatment and protection of pollution generated in the production process.
Tin contains lead. In the past, lead in solder wire classified solder as an occupational hazard position (in the national occupational disease catalog); now our general enterprises use lead-free solder wire, the main component is tin, as measured by the Center for Disease Control and Prevention It is tin dioxide; it is not in the national list of occupational diseases.
Generally speaking, lead fume will not exceed the standard in the lead-free process, but there are other hazards in soldering, such as flux (rosin-like substances) has certain hazards, which depends on the specific situation. Employees can usually check the logo and category of the tin distributed, so that they can have evidence and ask the company to rectify (they can give their opinions to the factory's internal trade union). If the tin used contains lead, it must be harmful to the body. After a long time, they accumulate in the body and damage the immune system of the nervous system.
Lead-free solder wire is environmentally friendly, but lead-free solder wire is also harmful to the human body. The low lead content of lead-free solder wire does not contain lead. Compared with lead-containing solder wire, lead-free solder wire is harmful to the environment and human body Pollution is less than leaded. The gas produced during soldering is toxic, and it is produced by gas vapors such as rosin oil and zinc chloride.
