Sulfur Free Paper for PCB Board and Circuit Board

The most important characteristic of sulfur-free paper is that it does not add sulfur in the production process, nor does it release sulfur ions, which eliminates the possibility of chemical reaction between sulfur and the silver layer on the PCB board at the root, preventing the silver layer from yellowing, turning black or being corroded.

In the production process of PCB boards, especially after the silver precipitation process, the silver layer is easy to chemical reaction with the sulfur in the air, generating silver sulfide, resulting in yellowing and blackening of the silver layer, affecting the appearance and performance of the PCB board. Sulfur-free paper can eliminate the possibility of chemical reaction between sulfur and the silver layer on the PCB board.

Sulfur-free paper is neutral in pH and has good chemical stability. In the process of contacting with the PCB board, it will not cause chemical reactions such as corrosion of the metal layer or other materials on the PCB board due to acidity and alkalinity problems. The use of sulfur-free paper can isolate the silver layer of the PCB board from the air, preventing the oxygen in the air from reacting with the copper layer under the silver layer, and playing a role in protecting the copper layer from being oxidized.

The surface of sulfur-free paper is smooth, flat, no wrinkles, no defects, no hair, no flakes. It is very important for the production and storage of electronic components and optical devices with high cleanliness requirements, which can avoid impurity contamination of the protected items.

Application Scenarios of Sulfur Free Paper
 ● PCB board production process
In the production process of PCB boards, from the completion of the silver immersion process to the subsequent assembly and testing, sulfur-free paper can be used for temporary wrapping or padding of PCB boards to play a protective role.
●  PCB Board Storage
During inventory storage of PCB boards, wrapping or compartmentalizing PCB boards with sulfur-free paper can protect PCB boards from sulfur and oxygen for a long period of time and extend their shelf life.
 ● PCB Transportation
During the transportation of PCBs, sulfur-free paper can be used as a cushioning and protective material to prevent friction and collision between PCBs, and can also resist the influence of sulfur, moisture and other harmful factors in the external environment.