Method of preparing acid resistant glass fibers
AssigneePPG Industries, Inc.
InventorIsaac A. Zlochower
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Abstract
Acid resistant glass fibers are prepared by treating the surface of a siliceous glass fiber with an aqueous acid solution to increase the silica content thereof. The aqueous acid solution is removed from the surface of the glass fibers and the fibers are heated to dehydrate or partially dehydrate the surface. The glass fibers as produced have a dual composition; the outer surface of the fiber is rich in silica in relation to the core of the fiber. The fibers so formed are highly resistant to acid attack.
Claims12
A method of preparing a dual composition, acid resistant glass fiber comprising contacting the surface of the siliceous glass fiber with an aqueous acidic solution at a pH and temperature and for a period of time sufficient to increase the silica content of said surface without substantially reducing the tensile strength of said fiber and producing a glass fiber having an overall SiO.sub.2 content of 52 to 64 percent by weight, removing said aqueous acid solution from the surface of said fiber and heating the fiber after removing said acid solution for a time and at a temperature sufficient to render the surface of said fiber acid resistant.
Dependencies are inferred from the claim text.