Moisture indicator
AssigneeBacharach, Inc.
InventorsMariano Greco, Brenda Lesperance, Grace L. Shine
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Abstract
A method and product whereby color changing indicator salts such as cobaltous salts, preferably CoCl.sub.2 or CoBr.sub.2, are firmly adhered to sand, other particulate silicas or other carriers so that unwanted fines, material loss and solvent washing characteristic of prior indicator salt-coated carriers are eliminated. The process is carried out by thoroughly dehydrating a quantity of cobaltous salts and dissolving and storing the dehydrated cobaltous salt in absolute alcohol, preferably absolute ethanol. The absolute alcohol/cobaltous salt solution is then contacted onto a dehydrated or anhydrous carrier material and the absolute alcohol solvent is removed.
Claims13
A process for preparing a moisture indicator material, comprising the steps of dehydrating a carrier material comprising 10-100 mesh sand, dehydrating a quantity of a cobaltous indicator composition which changes color upon exposure to moisture, dissolving said cobaltous indicator composition in an absolute alcohol solvent, contacting said carrier material with said dissolved cobaltous indicator composition and removing said absolute alcohol solvent, wherein spalling of said cobaltous indicator composition from said carrier material is drastically reduced compared to moisture indicator materials in which the carrier is not preliminarily dehydrated and in which the solvent is not absolute.
Dependencies are inferred from the claim text.