All in the Ammonia/Cupric etchant camp, Having just returned from a trip outside the US, my apologies for adding to this topic late. From a logical standpoint, when designing an etch line, it is best to use the etchant that gives the best quality etch results at the lowest cost, which would be zero-free-acid cupric chloride, and then have the etcher length you need to get the speed you want. Since an etcher typically lasts 5-7 years, adding length to get more speed makes sense when you amortize the cost over that time. Since you purchase chemistry and live with the quality issues on a daily basis, it makes the most sense to go with the highest quality and lowest running cost etchant. Best regards, Phil Culpovich Oxford V.U.E., Inc. mailto:[log in to unmask] -----Original Message----- Date: Fri, 10 Sep 1999 13:06:30 +0100 From: Jim Douglas <[log in to unmask]> Subject: Re: Ammoniacal vs Cupric chloride Etcher. Albert Herewith contact for Cuprammonium Sulphate ELO-CHEM Recycling Anlagenbau GmbH Lippertreuter Str. 7 D-88682 Salem-Rickenbach tel: +49 7553 7051 / Fax: +497553 7052 email 1 [log in to unmask] email 2 [log in to unmask] Contact Christian Bernauer Note that Rudy has different experiences to our own. However it all depends on solution conditions and etch machine etc. Our process etches faster than ammonium chloride with better undercut. Jim Douglas ---------- From: Albert Mok[SMTP:[log in to unmask]] Reply To: TechNet E-Mail Forum. Sent: 10 September 1999 03:06 To: [log in to unmask] Subject: Re: [TN] Ammoniacal vs Cupric chloride Etcher. Dear Jim, I am interested to know where and how we can acquire the information for ammonium sulphate etching system is etching faster than that of ammonium chloride. > >Jim Douglas >Kam Circuits > >############################################################## >TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c >############################################################## >To subscribe/unsubscribe, send a message to [log in to unmask] with following text in >the body: >To subscribe: SUBSCRIBE TECHNET <your full name> >To unsubscribe: SIGNOFF TECHNET >############################################################## >Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional >information. >If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or >847-509-9700 ext.5365 >############################################################## > > Albert Mok **************************************************************************** * ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################