Printed circuit board Manufacturer, Photoplotting   All types of Pcb, surface mount sm, PTH, SS single sided, ML multi layer prototypes. Cheap high quality PCBs Printed circuit boards. 

Cheap, easily recoverable etch used for etching PTH circuit boards, also used as a micro etch (chemical sandpaper) before plating processes. A straight mixture of Sulphuric and Peroxide makes a very fast etchent, but sadly is unstable and not safe to use. Additives are added such as Aryl Sulfonic acids to stabilize the peroxide in solution, and even Phosphoric acid which helps to retain a cleaner tin lead over the copper. Std Reaction is :-

Cu + H₂O₂ + H₂SO₄ >> Cu²SO₄ + 2H₂O

Copper can be recovered as copper sulphate by cooling and crystallization, or as metallic copper by electroplating. This is often done by plating onto stainless steel plates using lead or graphite anodes. After which the copper can be easily peeled off the stainless steel plates.