Preheat indicator
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United States of America Patent
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Mar 12, 1991
Grant Date -
N/A
app pub date -
Nov 2, 1989
filing date -
Nov 2, 1989
priority date (Note) -
Expired
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Abstract
The present invention relates to a ceramic body suitable for use in molten metal filtration applications having a built-in preheat indicator and method for forming such a ceramic body. The preheat indicator comprises a dye having a burnoff temperature substantially equal to the desired preheat temperature applied to a surface of the ceramic body. In a preferred embodiment, the dye comprises an aniline dye such as Backmeier's crystal violet.
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