Increasing chemical stability of annealed hollow glassware

Abstract

We will discuss the results of the authors experiments on improving the chemical stability of various types of annealed commercial glassware (i.e., after their manufacture) as well as of those in storage and use. The main points of the technique developed are as follows. A fixed quantity of the reagent is introduced into the glassware at room temperature, followed by heat treatment, during which the glass surface is leached out. For the investigation we used a variety of hollow glassware: containers (bottles, flasks, jars, etc.) from decolorized, dark-green, and brown glasses, diffusers from colorless and opal cased glasses, laboratory and high-quality vessels, ampuls from clinical glass, etc. The glass surface was leached with sulfur dioxide, hydrogen chloride and fluoride, difluorodichloromethane, difluorochloromethane, and mixtures of gases