Ed Try adjusting the pH. Low pH gives slower plating and a higher Phosporous content. High pH ( eg 5 - 6 ) gives faster plating and a lower Phosphorous - don't push it too high or the nickel will begin to precipitate out, it can be brought in again by lowering the pH but it all gets messy. Hope this helps Chris Evans MBD UK ______________________________ Reply Separator _________________________________ Subject: [TN] Phosphour in Electroless Nickel Author: "\"TechNet E-Mail Forum.\" <[log in to unmask]>, \"Eltek Ltd. - Process Engineering\"" <[log in to unmask]> at INTERNET Date: 21/10/98 07:38 I sent this message last week . No one responded . Maybe this week ? Hi We are running in our plant Electroless nickel - Immersion Gold ( ENIG ) finishing for PCB based on Atotech chemistry . Phosphour content is in middle range ( average 9% ) . One of our customers request low phosphour content - less than 7% . We ae trying to force the chemistry to plate Nickel with such content of phosphour by rising the temperature , increasing volume load ( sq cm per liter of working solution ) etc , but untill now we do not have stable process parameters . Any recommendation for Atotech chemistry or someone else chemistry to achieve the goal of phoshpour content in nickel less than 7% ??? Regards Edward Szpruch Eltek Ltd - Israel Tel 972 3 9395050 Fax 972 3 9309581 E-mail : [log in to unmask] ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ TechNet E-Mail Forum 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's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################