Use intention and storage factors of sulfur-free paper
Sulfur-free paper In order to prevent PCB oxidation, PCB has a silver precipitation process during this process, so PCB is also called immersion silver board. The silver plating process has become one of the important methods for the outer surface treatment of printed circuit boards. But there is a strong affinity between silver and sulfur. When encountering hydrogen sulfide gas or sulfide ions, it is easy to produce silver salts (Ag2S) that are difficult to dissolve in the air.
Because the deposition speed of silver is very fast, a low-density silver precipitation layer is formed, which makes the copper under the silver layer easy to contact with air, so thicker and thicker silver plating layer is needed to achieve oxidation resistance. This means that the sulfur-free paper must be produced with a thicker silver layer, which increases production costs and increases the likelihood of weldability problems, such as micro-gaps and poor weld quality. If you touch the silver plate, you must wear sulfur-free gloves. During observation and transfer, the submerged silver board must be separated from other objects with sulfur-free paper , and at the end of the specified 8 hours, the silver board must be separated from the packaging bag with sulfur-free paper. When removing the package from the silver-plated wire.
In summary, the intention of using sulfur-free paper is as follows:
Sulfur-free paper itself does not contain sulfur and will not react with the appearance of the PCB silver layer.
Sulfur-free paper can play a role of isolation, preventing the silver layer under the copper layer and oxygen in the air.
Sulfuric acid paper wholesale tells you, sulfur-free paper storage precautions:
Store in a gentle cold air warehouse, prevent direct sunlight, stay away from fire and water, pay attention to prevent high temperature, pay attention to moisture, and prevent contact with liquids (especially Acid and alkali) contact. The body of the PCB is copper. The copper layer is very simple. Oxygen in the air is oxygen. The reaction produces dark brown cuprous oxide.
The above is the use intention and storage factors of sulfur-free paper that we explain to you. I hope it will be helpful to you.
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