BAU 2013 is a 180,000 m² showcase of materials, technologies and systems. That´s the equivalent of 25 football pitches filled with state-of-the-art technology for the international building and construction industry. In a five-part series, we present a succinct review of what the main focuses will be in 2013 in the individual sections at the fair. In Part 3, we look at chemical building products, aluminum, and steel / stainless steel / zinc / copper.