Sulfur-Free Paper for PCB

PCB Sulfur-free Paper - Special packaging paper for printed circuit boards

Why does PCB need sulfur-free paper?

In the PCB industry, sulfur-free paper is an important industrial paper that cannot be bypassed. The main body of a PCB is copper, and the copper layer is very likely to react with the oxygen in the air, generating cuprous oxide which is dark brown. To avoid oxidation, there is a silver immersion process during the PCB manufacturing process, so the PCB is also known as a silver immersion board. The silver immersion process has become one of the final surface treatment methods for printed PCB circuit boards, and sulfur free paper with the silver immersion process has become an important paper in the PCB industry. During the production and transfer process of PCBs, such as moving from one link of the production line to another, or during temporary storage and transfer, sulfur-free paper can separate the PCBs, preventing their surfaces from coming into direct contact with other objects, avoiding scratches and abrasions, and protecting the circuits, soldering points, and various coatings on the PCB surface.
In addition, for other electronic components containing silver parts or those sensitive to sulfur, such as capacitors, resistors, and chips, sulfur-free paper can also be used for packaging during the production, storage, and transportation processes. It protects the sensitive components from the erosion of sulfur, avoids damage to the components caused by sulfur, and ensures their stable and reliable performance.