Nancy, We use Kester TC527 latex mask. It peels off and residues are cleaned. We have not had any problems with it to date. Hope this helps some. Eric Kalgren BFGoodrich Aerospace Data Systems Division [log in to unmask] (505) 938-5139 >>> Nancy Trumbull <[log in to unmask]> 10/07/99 06:12AM >>> HI Technetters, Every one did so good for me on the electrical migration that I'm back. Problem: Solder is seeping under the removable solder mask during wave solder. Key word :REMOVABLE Investigation: Indicates Poor process at the supplier Supplier states "that this problem is typical of removable solder mask made in the states". Key words :made in the States. Because they can not use the same type of material as over sea. I have IPC-SM-840C Qualification and Performance of Permanent Solder Mask This does me no good. Our Supplier will remove some of the ID landing. Which should stop the seepage during wave solder. But I would like more information on Removable Solder Mask Standards in the States. I have ask for information on removable solder mask before and got no reply . Could this be something fairly new for the states? My pass experience has always been with over sea suppliers for this type of product. Thanks to all that reply in Advance Nancy ############################################################## 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 ############################################################## ############################################################## 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 ##############################################################