Method for increasing the chemical durability of borosilicate glass tubing and articles made therefrom.

摘要

A method of increasing the chemical durability of borosilicate glass tubing and also hollow articles made therefrom by adding about 2 to 3% by volume of a fluorine-containing gas, i.e. C2F6, to the inflating air used to form the tubing using conventional tube-forming methods. The alkalinity of the borosilicate glass tubing surfaces, as well as the surfaces of containers, including ampoules made therefrom, is reduced by as much as 70% by weight or more.