The chemicals used in the PCB etching process vary depending on the type of etchant used.
Among them, ammonia, hydrofluoric acid, nitric acid, sulfuric acid, hydrochloric acid, etc. are all commonly used chemicals in PCB etching. These chemicals can be used to etch various PCB board materials, such as FR-4, FR-5, FPC, etc.
In addition, during processes such as circuit pattern making, copper foil etching, and circuit board production and circuit welding, the flexible circuit board uses ink to cover the portion of the copper foil that needs to be protected. These processes produce high concentrations of organic matter and ammonia nitrogen.
It should be noted that the chemicals and etchant types used in the specific PCB etching process need to be determined based on the specific process and materials. At the same time, the use of these chemicals must follow corresponding safety regulations and operating procedures to ensure production safety and human health.