Methods for producing low density products
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United States of America Patent
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Nov 25, 2008
Grant Date -
Dec 30, 2004
app pub date -
Feb 25, 2004
filing date -
Aug 23, 2002
priority date (Note) -
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Abstract
A method of preparing a low-density material and precursor for forming a low-density material is provided. An aqueous mixture of inorganic primary component and a blowing agent is formed, the mixture is dried and optionally ground to form an expandable precursor. Such a precursor is then fired with activation of the blowing agent being controlled such that it is activated within a predetermined optimal temperature range. Control of the blowing agent can be accomplished via a variety of means including appropriate distribution throughout the precursor, addition of a control agent into the precursor, or modification of the firing conditions such as oxygen deficient or fuel rich environment, plasma heating etc.
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