Using Hydrogen Peroxide/Sulphuric Acid Spray Circuit Etchant

Among the many types of printed circuit board etchant now available, there are a variety of notable advantages and disadvantages. This is confusing to the PCB manufacturer because all of these etchants work relatively well. In order to assess the advantages of a given etchant properly, the circuit engineer must consider all aspects of its use including its effect on plant effluents and the difficulty of recovering etched copper from solution. Peroxide/sulphuric etchant offers distinct advantages in these areas of peripheral cost, as discussed in detail in this paper.