Randy I would not use IPC-A-600 or IPC-A-610 as a procurement specification as these are visual standards for the performance specifications IPC-6012 (was IPC-RB-276) and J-STD-001. The introductory paragraphs in the "A" so states this and you have no sampling plan or periodic evaluations requirements in the "A" documents. As many usaer have found out later, if you buy to IPC-A-600 alone there are no requirements that the supplier ever look at your product at any time to verify conformance, if at one toime in the distant past he made a prodcut that met the A-600 requirements that are shown in the pictures, some suppliers will tell you you that they looked the first board on your order and thea was good enough. Preferred callout is " Soldering shall conform to J-STD-001 (Class 2 or what ever) using visual acceptability standard IPC-A-610. With the board specification you should state "The board shall be fabricated to IPC-6012 Class 2 using IPC-A-600 as a visual acceptability document. The 6012 states that you should specify on the drawing what your minimum spacing shall be on the drawing. A very common practice is to state that you want it fabricated per IPC-6012 Class 2 and then list the exceptions on the drawing. For example you state "----except spacing shall not be less than x.xxx inches including isolated areas at any place between circuits". Unless you have extremely limited spacing requirements, board houses do not add more cost for these kind-of normal conditions that are required for you product. Phil Hinton [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 ##############################################################