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Anti-oxidation alloy ratio of lead-free environmental protection tin bar

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Update time : 2022-11-17 20:10:40
Lead-free environmentally friendly tin bars are basically lead-free tin bars, usually made of lead-free pure tin, pure copper or pure silver, and anti-oxidation alloys in proportion, and then processed by high-temperature dissolution, refining, impurity removal, and other processes. The alloy products are cast into strips with molds or die-cast into strips by hydraulic presses, so they are called lead-free solder strips. (Sn99.3/Cu0.7). Among them, the content of lead and Pb is controlled below 100ppm or even lower, and the content of other metal elements is basically tens or several ppm! Generally, there are alloy solder bars made of tin-copper, tin-silver, and tin-silver-copper metal elements. (EU RoHS standard is less than 1000PPM lead content, Japanese standard is less than 500PPM).
The price difference of lead-free solder bars with the same quotation is about 10 yuan, which is confusing for buyers. In fact, there are different levels of lead-free solder bars, and the prices of lead-free solder bars of different standards are naturally different. An important criterion for grading is the lead content. The lead content of tin produced from raw materials is relatively low, and most of the tin produced from waste tin has many impurities and does not meet the standard, and the price is relatively much cheaper. Tin factories with a lead content below 100PPM are relatively rare. Buyers not only look at the price, but more importantly, consider the product quality.
The lead-free environmentally friendly tin bar does not mean that it does not contain lead at all, but the lead content in its alloy is quite small, and the trace elements inside can be distinguished by the ratio of millions of parts. At present, the lead-free environmentally friendly tin bar is to adapt to the European Union Environmental protection requirements put forward the important industrial raw materials of Rohs standard, which are widely used in electronics industry, home appliance manufacturing, automobile manufacturing, maintenance industry and daily life.
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