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Since 1963, Lego pieces have been manufactured from a strong, resilient plastic known as acrylonitrile butadiene styrene (ABS). As of September 2008, the engineers use the NX CAD/CAM/CAE PLM software suite to model the elements. The software allows the parts to be optimized by way of mold flow and stress analysis. Prototype molds are sometimes built before the design is committed to mass production. The ABS plastic is heated to 232 °C (450 °F) until at a dough-like consistency. It is then injected into the molds at pressures between 25 and 150 tons, and takes approximately 15 seconds to cool. The molds are permitted a tolerance of up to two micrometres, to ensure the bricks remain connected. Human inspectors check the output of the molds, to eliminate significant variations in color or thickness. According to the Lego Group, about eighteen bricks out of every million fail to meet the standard required. Lego factories recycle all but about 1 percent of their plastic waste from the manufacturing process every year. If the plastic cannot be re-used in Lego bricks, it is processed and sold on to industries that can make use of it.
Manufacturing of Lego bricks occurs at a number of locations around the world. Molding is done in Billund, Denmark, Nyíregyháza, Hungary and Monterrey, Mexico. Brick decorations and packaging is done at plants in Denmark, Hungary, Mexico and Kladno in the Czech Republic. The Lego Group estimates that in the course of five decades it has produced some 400 billion Lego blocks. Annual production of Lego bricks averages approximately 20 billion (2×1010) per year, or about 600 pieces per second: if all the Lego bricks ever produced were to be divided equally among a world population of six billion, each person would have 62 Lego bricks. According to an article in BusinessWeek in 2006, Lego could be considered the world's No. 1 tire manufacturer; the factory produces about 306 million tiny rubber tires a year.