Hi Stein - There are a number of water soluble, acid fluxes that you could use for your tinning operation for several manufacturers. I have seen the Superior 30 work well in several applications. I am surprised that the ESA specification (this is one spec I have never seen) allows the use of a acid flux in place of a RMA, especially for space applications. Whatever acid flux you do choose I would suggest you run some cleanliness tests to assure yourself that your tinning process does not leave a residue on the components that could lead to corrosion. Good Luck. Dave Hillman Rockwell Collins [log in to unmask] [log in to unmask] on 09/17/97 06:50:40 AM Please respond to [log in to unmask]; Please respond to [log in to unmask] To: [log in to unmask] cc: (bcc: David D Hillman/CedarRapids/Collins/Rockwell) Subject: [TECHNET] Pretinning - Flux Technetters, I have some problems pretinning some components stored for 5 years. The components shall be used in space equipment and according to ESA-PSS-01-708 we can use rosin based flux (RMA) for pretinning. If RMA flux are inadequate, corrosive water-soluble acid flux can be used. For our components RMA flux does not do the trick. 1) Does anyone know a good method that can be used? 2) Does anyone know suppliers of corrosive water-soluble acid fluxes? 3) We have heard of a flux type called SUPERIOR 30. Can anyone tell me about suppliers of this flux? Thanks, Stein Davidsen ############################################################## 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. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ############################################################## ############################################################## 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. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################