METHOD OF STRENGTHENING GLASS CONTAINERS

摘要

A glass container is provided with a compressive stress layer at its exterior surface by the replacement of sodium ions in the glass surface with potassium ions of larger atomic diameter and the container is then provided with a plastic enveloping sheath of a thickness of .003" up to about 0.010" to provide a shock resistant, shard-retaining envelope for the container, where said sheath is applied while said container is at temperature of approximately 300.degree. F. to 600.degree. F.