In 1996, the plastics industry accounted for $274.5 billion in shipments. It is difficult to estimate the fraction of plastics used for corrosion control, because in many cases plastics and composites are used for a combination of reasons, including corrosion control, lightweight, economics, strength-to-weight ratio, and other unique properties. While corrosion control is a major market for many polymers, certain polymers are used mostly, if not exclusively, for corrosion control purposes. The significant markets for corrosion control by polymers include PVC pipe, polyethylene pipe, and fluoropolymers. Composites, in terms of corrosion control, generally refer to glass or other fiber or flake reinforced thermosetting resins. Composite products utilized for their anti-corrosion properties include fiberglass reinforced pipe, and storage tanks, fiber-reinforced plastic grating, handrails, I-beams, and other shapes equal to these made of steel. The portion of polymers used for corrosion control is estimated at $1.8 billion.