Water resistance of fine-vermiculite articles
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United States of America Patent
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Apr 10, 1990
Grant Date -
N/A
app pub date -
Apr 13, 1989
filing date -
Apr 26, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Certain articles required to function in air at temperatures of 250.degree. C. or higher comprise very fine particles of vermiculite from which the interstitial magnesium ions have been at least partially removed and which has been swollen in water. These articles are not ordinarily exposed to water when in use, but if they are they are likely to disintegrate quickly because of the ready dispersibility of the vermiculite particles. By the invention, water-resistance is given to such articles by treating them with a solution of an aluminate salt e.g. NaAlO.sub.2 or a zirconyl salt e.g. ZrOCl.sub.2.
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