WEATHER RESISTANCE OF PORCELAIN ENAMEL. EFFECT OF EXPOSURE AND OTHER VARIABLES AFTER 7 YEARS

AN EXPOSURE TEST OF PORCELAIN ENAMELS AT SEVEN REPRESENTATIVE SITES IN THE CONTINENTAL UNITED STATES WAS INTIATED 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. 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 AND WEATHER RESISTANCE. HOWEVER, ENAMELS OF DIFFERENT TYPES, SUCH AS 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 PORCELAIN ENAMELS PRODUCED AFTER THE END OF WORLD WAR II WERE EQUALLY RESISTANT TO CHANGES IN GLOSS AT THE WASHINGTON, D.C. 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. /AUTHOR/

• Supplemental Notes:
  • No 4, 16 pp
• Corporate Authors:

  Government Printing Office

  Superintendent of Documents
  Washington, DC  United States  20402-9325
• Authors:
  • Rushmer, M A
  • Burdick, M D
• Publication Date: 1966-5-2

Subject/Index Terms

• TRT Terms: Acids; Aluminum; Chemical resistant materials; Color; Crash exposure; Enamels; Field tests; Humidity; pH value; Reflection; Steel; Weathering
• Uncontrolled Terms: Acid resistance; Exposure
• Old TRIS Terms: Gloss; Porcelain
• Subject Areas: Geotechnology; Highways; Materials; Safety and Human Factors;

Filing Info

• Accession Number: 00216116
• Record Type: Publication
• Files: TRIS
• Created Date: May 25 1994 12:00AM