Raj, We have many customers (AT&T, Apple, IBM, Motorola, etc.) who would be happy to help you understand the cost vs benefit ratio for nitrogen in convection reflow. It depends a great deal upon your components and paste. The finer the pitch (less than 20 mil) and the lower the solids paste (5% and less), the lower the oxygen level you want to have to get good soldering. Give me a call if you'de like and I can put you in touch with users processing similar parts to you. Mark Nowotarski Manager, Advanced Soldering Development Praxair Inc. Tarrytown NY USA tel 914 345 6452