Persulfate crystals are used as an alternative to the traditional ferric chloride to produce a cleaner copper etchant solution.

Sodium Persulfate is a good replacement for Ammonium Persulfate for its compatibility with etch resist pens. Sodium Persulfate will not remove etch resist ink and like Ammonium Persulfate crystals, are used as an alternative to the traditional ferric chloride to produce a cleaner copper etchant solution. Mixed product must be stored in a vertical container.

A 1Kg bottle of Sodium Persulfate will make 4 Litres of etchant when mixed with water. Mix 250g of Sodium Persulfate for each litre of water.

Material Safety Data Sheet