Nancy You buy your board to IPC-6012, Class 3. The 600 document is a pictorial document that supplements the 6012 specification. 6012 has sampling plans and the required tests that are to be performed on each lot (for class 3) - like thermal stress as well as listing responsibilities for monthly tests. If you called out only 600 there are no requirements for testing - just the photos that show what your product should look like if you did the testing. IPC-6012, Class 3 correlates to the military specifications. Susan Mansilla Robisan Lab ################################################################ TechNet E-Mail Forum 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://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################