IMPROVEMENTS IN OR RELATING TO GLASS MELTING TANKS AND TO REFRACTORY MATERIALS FOR USE THEREIN

摘要

The glass melting tank for supplying a flat glass forming process has a melting zone for melting solid batch material and a refining zone with reduced return flow of glass. The base of the refining zone comprises a fusion cast refractory material comprising alumina, silica and between 31% and 43% by weight of zirconia. The refractory is conditioned by oxidation at at least 1450 DEG C. for 24 hours.