How do you etch printed circuit boards?

How do you etch printed circuit boards?

Dissolve 2-3 teaspoons of ferric chloride power in the water. Dip the PCB into the etching solution (Ferric chloride solution, FeCl3) for approximately 30 mins. The FeCl3 reacts with the unmasked copper and removes the unwanted copper from the PCB. This process is called Etching.

Is sodium persulfate harmful?

* Sodium Persulfate can affect you when breathed in. * Contact can cause severe skin and eye irritation and burns. * Breathing Sodium Persulfate can irritate the nose, throat and lungs causing coughing, wheezing and/or shortness of breath.

How do you make sodium persulfate?

Sodium persulfate can be prepared by electrolysis of a solution containing sodium and sulfate ions according to U. S. Patent No. 4,127,456 and U. S. Patent No. 4,144,144, as well as by the reaction of sodium hydroxide with ammonium persulfate as taught by U. S. Patent No.

What is the common name for sodium sulphate?

Sodium sulfate

Other names Sodium sulphate Disodium sulfate Sulfate of sodium Thenardite (anhydrous mineral) Glauber’s salt (decahydrate) Sal mirabilis (decahydrate) Mirabilite (decahydrate mineral)
CAS Number 7757-82-6 7727-73-3 (decahydrate)
3D model (JSmol) Interactive image

How do you remove unwanted copper from a PCB?


  1. Remove metals with silk screen printing.
  2. Use conductive ink on a non-conductive board to remove the unwanted copper.
  3. Photoengrave the PCB.
  4. Employ transparencies printed by a laser printer for most PCBs.
  5. Implement PCB milling to remove copper from the substrate.

Is sodium thiosulfate safe to use?

A new treatment reported for calciphylaxis, is the use of intravenous sodium thiosulfate. This inorganic salt is already used in the treatment of intoxication caused by cyanide, in patients with calcific nephrolithiasis and tumoral calcinosis, with very good and safe results.