The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
Date: Sun, 17 Nov 2002 16:18:54 +1100
From: Andrew Tweddle
X-Mailer: Mozilla 4.79 [en] (Windows NT 5.0; U)
Subject: Re: Etching: sodium persulfate vs ammonium persulfate??
Organization: Client of Alphalink Australia Pty. Ltd.
Terry King wrote:
> Somewhere in the 10 years since I last etched a board,
> Kepro has switched to Sodium Persulphate, with some
> Does anyone know what the tradeoffs are between
> sodium persulfate vs ammonium persulfate?
> I see ammonium persulphate (which I used to favor)
> sold as an etchant by some suppliers. Isthere
> some reason for the switch??
> Regards, Terry King ...In The Woods In Vermont
The Ammonium ion in aq soln carrys away the copper very effectively.
Sulphate ion is not as effective as chloride ion at etching copper at
the same temperature. As a trade off for kitchen sink use. ie. using an
elevated temperature to move the reaction rate along and relatively
safe, and non smelly compared to ammonium copper chloride which works
brilliantly but requires fume hoods, it isn't a bad one.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup