Chapter 29. Black Specking in Porcelain Enamel Powder Applications

  1. John B. Wachtman Jr.
  1. Vernon C. Jett

Published Online: 28 MAR 2008

DOI: 10.1002/9780470310489.ch29

Proceedings of the 49th Porcelain Enamel Institute Technical Forum: Ceramic Engineering and Science Proceedings, Volume 9, Issue 5/6

Proceedings of the 49th Porcelain Enamel Institute Technical Forum: Ceramic Engineering and Science Proceedings, Volume 9, Issue 5/6

How to Cite

Jett, V. C. (1988) Black Specking in Porcelain Enamel Powder Applications, in Proceedings of the 49th Porcelain Enamel Institute Technical Forum: Ceramic Engineering and Science Proceedings, Volume 9, Issue 5/6 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470310489.ch29

Author Information

  1. Mobay Corp. 5601 Eastern Ave. Baltimore, MD 21224

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1988

ISBN Information

Print ISBN: 9780470374795

Online ISBN: 9780470310489

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Keywords:

  • plague;
  • electrostatic;
  • susceptible;
  • coatings;
  • microscopic

Summary

The most troublesome defect of the various defects that plague porcelain enamellers is the black speck. Unfortunately, this defect occurs more often in the two-coat one-fire, electrostatic powder process than it does in the more laborious, less efficient two-coat two-fire wet system. The causes of black specks are many and presented here, with their photomicrographs, are ten of them.