I haven't seen any industry guidelines, however, occasionally a customer who has been "burned" will specify .002 max. This is achievable with straight masking operations. If performing separate "postplugging" operations after primary mask application and surface finishing etc., it's important to insure that the primary mask has a clearance at the location that is to be postplugged. Otherwise if the hole is partially plugged etc., the secondary masking operation will leave a very undesirable bump approx. .005-.006 high. These specialized operations drive inspectors and CAM operators absolutely crazy. Additionally, most customers are neither consistent with their data or assembly needs. Typically, the masking information is the least considered by a designer. Couple this with third party contract assemblers and you have numerous opportunities for error. Mike Bailey Director of Engineering McCurdy Circuits Inc. 4900 E. Hunter Ave. Anaheim, CA 92870 Phone: 714 507-4900 Ext 253 FAX: 714 507-4911 e-mail: [log in to unmask] <mailto:[log in to unmask]> -----Original Message----- From: Rick Babyak [mailto:[log in to unmask]] Sent: Friday, March 31, 2000 4:47 AM To: [log in to unmask] Subject: [TN] via plugging Is there any acceptance criteria or a spec out there that covers via plugging with mask/ink? Rick Babyak Process Engineer Proto Circuit Inc. 7 Ascot Parkway Cuyahoga Falls, OH 44223 330-572-3401 Fax:330-572-3434 [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. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ############################################################## ############################################################## 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 Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################