In the beginning of 1990 Pennwalt was bought by Atochem North America. As part of the sale, the Federal Trade Commission stipulated that Atochem sell one of its two Kynar manufacturing facilities, and Ausimont Inc. bought one of the plants. There are also PVDF resins imported into the U.S. which are not Kynar 500. This is why throughout this article I have referred to Kynar 500 as PVDF wherever possible. PVDF is relatively chemically inert and will outlast anodizing in corrosive environments.
Window washers can be less discriminating about the types of chemicals they use to clean a building.
If extremely corrosive cleaners are used, however, even PVDF will show signs of damage. PVDF coatings offer nearly an unlimited selection of colors and are easy to manufacture in small batches. Coil painted sheet is less expensive than anodized sheet and does not craze as badly when fabricated. Color consistency is usually better than with anodizing. It is surprising, however, how many of our customers do not expect the slight variations that are seen in the color of painted products.