- Author
- Rushmer, M. A. | Burdick, M. D.
- Title
- Weather Resistance of Porcelain Enamels: Effect of Exposure Site and Other Variables After Seven Years.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
- NBS BSS 004, May 2, 1966, 18 p.
- Keywords
- weather effects | acid resistance | color | humidity | exposure
- Identifiers
- gloss; porcelain enamel; weather resistance
- Abstract
- An exposure test of porcelain enamels at seven representative sites in the continental United States was initiated by the National Bureau of Standards and the Porcelain Enamel Institute in 1956. After seven years all specimens were returned to the Bureau and the changes in gloss and color determined. These changes were found to be different at all exposure sites except Pittsburgh and New Orleans. The most severe changes occurred for specimens exposed at Kure Beach, 80 feet from the ocean, while the least change occurred for specimens exposed at Los Angeles. The differences in behavior of the specimens correlated with both the relative humidity and the pH of the suspended particulate matter at the different sites. A direct relation existed between the acid resistance of the enamels on aluminum and steel, having the same acid resistance did not necessarily show the same weather resistance. Comparison with enamel specimens exposed for seven years in an earlier test showed that procelain enamels produced after the end of World War II were equally resistant to changes in gloss at the Washington, DC, site as those produced before the war. As a group, the regular glossy acid-resistant enamels on steel showed the best weather resistance of the various types tested. No corrosion of the base metal was noted for any specimen on which the initial coverage was complete.