Sirs, Sub : Cross-Hatching for Ground Portion of PCBs I would like to know the reason for providing cross- hatch patterns in the ground portion of the PCBs instead of being fully covered by copper. Is there any specific advantage apart from providing good adhesion for the solder-mask? Does it help in prevention of warpage of PCBs? What is the effect on the electrical resistance? Is any documented info available on this aspect? Regards. Mr.Murulidhara S. Deputy Chief Engineer , PCB and Chemical Lab - R&D, ITI Ltd. , Dooravani Nagar , Bangalore INDIA PIN-560 016 Ph : 91-080-8503959 Fax : 91-080-5650971 --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------