I would concur with S. Ng, that a Vitronics 310 with 4 top and 3 bottom zones will have a hard time to controlling the "time above liquidus" as well as uniformity. A forced convection oven with more zones allows much better control and uniformity. However, there is no such thing as a 'pure Infrared' oven; in so-called "IR Reflow Ovens" in access of 50% of the heat transfer is by convection, depending on the zone. Likewise, in "Forced Convection Reflow Ovens" up to 25% of the heat transfer is by radiation, depending on gas flow and platen temperature. Werner Engelmaier Engelmaier Associates, Inc. Electronic Packaging, Interconnection and Reliability Consulting 23 Gunther Street Mendham, NJ 07945 USA Phone & Fax: 201-543-2747 E-Mail: [log in to unmask] *************************************************************************** * TechNet mail list is provided as a service by IPC using SmartList v3.05 * *************************************************************************** * To unsubscribe from this list at any time, send a message to: * * [log in to unmask] with <subject: unsubscribe> and no text. * ***************************************************************************