In the developing countries of Eastern Europe, Asia (exclusive of Japan) and the Africa/Mideast region, gains will outpace the global average, benefiting from ongoing infrastructure development. Economic growth in these countries will create demand for plastic pipe in networks for telecommunications and in residential home building applications. Ongoing efforts across these regions to upgrade water treatment systems will boost demand for plastic pipe used for potable water delivery and in drainage and sewage applications. Finally, in many nations, demand is expected to benefit from the expansion of natural gas distribution networks. Polyvinyl chloride (PVC) is the leading plastic pipe resin, accounting for nearly two-thirds of plastic pipe demand by weight in 2007. PVC pipe is popular because of its low cost, durability, strength and ease of extrusion, allowing it to make inroads against nonplastic pipe materials. Demand for HDPE pipe will benefit from use as small-diameter pipe in natural gas transmission, as conduit for electrical and telecommunications applications, and as corrugated pipe for drains and sewers. While comparatively small, demand for fiberglass pipe will post well above average gains, reflecting growth in extreme environment applications.