PCB etching is a highly intricate process that’s crucial for the fabrication of printed circuit boards. It helps produce the final circuit pattern by effectively removing copper from the PCB.

There are two different methods for inner and outer layer etching. In the outer layer etching process, tin plating is used as an etching resist. However, in the inner layer, the photoresist is a resist.

PCB wet etching method

Wet etching is an etching process in which unwanted materials are dissolved when immersed in a chemical solution.

PCB manufacturers jointly use two wet etching methods according to the etchant used.

Acid etching (ferric chloride and copper chloride).

Alkaline etching (ammonia)