boiler scale

boiler scale

[′bȯil·ər ‚skāl]
(chemistry)
Deposits from silica and other contaminants in boiler water that form on the internal surfaces of heat-absorbing components, increase metal temperatures, and result in eventual failure of the pressure parts because of overheating. Also known as scale.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

boiler scale

Metal from the inner surfaces of a boiler which decomposes and flakes off (in much the same manner as rust forms).
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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