Experiments were conducted to determine the feasibility of using waste slate and limestone as a substitute for asbestos when producing glass powders and fibers. Glasses were made from mixtures of Vermont slate and limestone. The alkali resistance of the glass powders and the glass fibers was superior to that of glass powders and glass fibers based on compositions containing large amounts of zirconia. Some of the present glass compositions have alkali- resistance almost as good as that of chrysotile asbestos. Because of the low cost, ready availability in the United States, low melting temperatures, and ease of rendering into glass fibers, waste slate and limestone can be considered as substitutes for asbestos for many cement-type applications.
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