Method of improving the annealing point of a 96% silica glass article made by consolidating a glass article of high silica content having throughout its mass a multiplicity of submicroscopic intercommunication pores which includes heating the porous article to a temp of 900-1050o in a non oxidizing atm containing at least 5% by vol of NH3 and its dissociation products and thereafter consolidating the thus treated glass in non oxidizing atm between 1300-1350o.
Origin
Unknown
Journal Title
Corning Glass Works, U.S Pat. 3,113,008, 3/12/63
Sector
Primary Papers
Class
PP 1445