Alkali resistant glass compositions

Details Alkali resistant glass compositions Alkali resistant glass compositions

2006-02-24

2010-06-29

Marcantoni, Paul (Department: 1793)

Compositions: coating or plastic

Coating or plastic compositions

Alkali metal silicate containing

C106S600000, C501S033000, C501S053000, C501S068000

Reexamination Certificate

active

07744689

ABSTRACT:
An alkali resistant glass composition having improved durability to withstand highly alkali environments at elevated temperatures, such as curing of cementitious products in an autoclave, is conveniently formed from economical and abundant materials. The glass composition includes increased levels of calcium and iron, and relatively low levels of alkali metals, as compared to many other alkali resistant glass products, and comprises essentially of, by weight, >35% Si2O3, 1-25% CaO, 1-15% Fe2O3, 1-10% R2O, and an amount of Al2O3such that the ratio of Si2O3:Al2O3is greater than or equal to 1. Alkali resistance can be improved by forming a passivity layer on the surface of glass articles by treating the articles hydrothermally in a basic environment. Optionally zirconia and/or titania may be added to the composition to further improve alkali resistance.

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