Method for manufacturing an opal borosilicate glass
AssigneeFMC Corporation
InventorsRichard L. Lehman, William H. Manring
Life of this patent
Estimating the term…
Abstract
The dusting and segregation of the glass batch during the manufacture of opal borosilicate glass can be reduced by adding the phosphorus values to the glass batch as phosphoric acid, and calcium values as limestone, calcium carbonate or calcium oxide.
Claims12
In the process of melting and refining a glass batch containing sand and other glass-forming ingredients to form an opal borosilicate glass product wherein said batch is heated and melted at temperatures from about 1400.degree. C. to about 1650.degree. C. and wherein a phosphorus-containing compound and a calcium-containing compound are added to said batch, the improvement which comprises adding a compound selected from the group consisting of limestone, calcium carbonate, and calcium oxide as the calcium-containing compound and wetting the batch with phosphoric acid whereby the phosphorus-containing compound is supplied and a cohesive glass batch is formed, said batch being wetted by adding phosphoric acid thereto subsequently to the addition of the sand and calcium-containing compound.
Dependencies are inferred from the claim text.