The physical properties of synthetics are essentially those of the polymers from which they are made. The king of the polymers is polyethylene, or PE. It is produced in the highest volume globally and its production (or consumption!) is considered a measure of industrial growth.
The second most common polymer in the world is polypropylene, or PP. According to a report from GBI Research, the global PP market is predicted to reach 62.4 million metric tons by 2020. In terms of end-use consumption, construction currently accounts for 5 percent of the PP market.