Description: Ammonium Persulfate (NH4)2S2O8
There are three common PCB etchants used in electronics PCB: ferric chloride [FeCl3], ammonium persulphate [(NH4)2S2O8], and sodium persulfate [Na2S2O8] Another popular copper etchant is cupric chloride [CuCl2], or copper ii chloride, which can be made at home.
This product is a 200 gram of Ammonium Persulfate (NH4)2S2O8
Add the water to this power to make a solution,
The mixture should be 200g of ammonium persulfate on 1 liter of water
Upsides:
- It is clear, so you can see how well it is working.
- It is compatible with the tin resist process.
Downsides:
- It requires an elevated temperature.
- least aggressive PCB etchant than Ferric Chloride.
- The fumes are toxic (use it in a good ventilated environment).
- It is relatively expensive compared to FeCl3.
- It is not compatible with resist pens.
Some links:
It has a limited shelf life after adding water to make the solution