older paste using tin/lead, popularly known as Sn/Pb has been the most important element of solder paste until global agencies threatened its popularity in favor of lead-free solder paste and other environmentally friendly alternatives. Although this has not taken effect effusively, the market is uncertain as to what the effect will be of the European Union's regulation to eliminate lead from electronics manufacturing by 2006. It will take time for lead-free to become effective.

lex circuits feature a three-dimensional shape, which saves a substantial amount of board space. The circuits also bend during installation and maintenance, making the rework and repair process easier. Additionally, they flex during use, increasing device reliability and longevity. With these features, flex circuits offer cost-effective solutions to problems in design, board assembly and packaging, most importantly in the areas of aerospace, defense, medical devices and commercial applications.