[log in to unmask] wrote: > Hi Gaby, > I would recommend, that you require thatmthe coupons on the panels for > your > PCBs contain the smallest hole diameter drilled for your PCBs. > Depending on > drilled PTH diameter and PCB thickness (Smaller diameters & thicker > PCBs are > worse), good plating may require special plating solutions allowing > plating > at lower plating current densities. I, of course, assume that your > PCB > vendor has vibrators in place on the plating frames for all wet > processing to > avoid entrapped air and/or hydrogen bubbles in the PTHs. > But, the integrity of the plating in small vias does not only involve > the > plating thickness, but also the quality of the copper deposited. The > deposit > also requires adquate strength and ductility to survive solder > assembly. > While tensile strength and fatigue ductility measurements of mandrel > samples > plated concurrently with your product give some indication, the copper > > plating quality on the PTH will almost always be below the properties > from a > mandrel sample. > That is why testing is done-- the new IST test is quick and > correlates, at > least qualitatively, with thermal cycling. > > Werner Engelmaier > Engelmaier Associates, L.C. > Electronic Packaging, Interconnection and Reliability Consulting > 23 Gunther Street In > December: 7 Jasmine > Run > Mendham, NJ > 07945 > Ormond Beach, FL 32174 USA > Phone & Fax: 973-543-2747 Phone: 904-437-8747, > Fax: 904-437-8737 > E-mail: [log in to unmask] > > ############################################################## > 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 > ############################################################## Thank you all for your help. Please tell me where I can find the IST test and if printed circuits manufacturers perform it for all batches as a standart test. Thank you, Gaby ############################################################## 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 ##############################################################