Ferric Chloride Steel Etching: Fast, Practical Advice

Summary for ferric chloride steel etching Discussion

Ferric chloride steel etching is discussed as an alternative to nitric acid for printing plates, but the original poster says trials produced crack patterns and etching times that were too long for a target depth of 30 to 50 microns in 4 to 5 minutes. The reply suggests that the ferric chloride should presumably be jet sprayed onto the plates rather than simply applied, and that the solution should be concentrated and kept around 45 °C. However, the answer also warns that the steel grade matters and that most steels will not withstand ferric chloride for very long. The practical takeaway is that faster etching may depend on process setup and material choice as much as on the chemistry itself.