This part of IEC 60068, which is a technical report, presents two approaches for establishing a possible temperature profile for a lead-free reflow soldering process using SnAgCu solder paste. This process covers a great variety of electronic products, including a large range of package sizes (e.g. molded active electronic components, passive components and electromechanical components). Study A addresses requirements needed in the production of high-reliability electronic control units (ECU), as for example in automotive electronics. These requirements include measurement and production tolerances. Study B represents consumer electronics products and includes reflow oven capability, board design and package sizes.