Continuous refining of low-viscosity molten glass is carried out in tank which has iridium coating on sections which contact glass and on tank inlet and outlet, coated sections being heated

摘要

Continuous refining of low-viscosity molten glass (1) is carried out in a tank (2) which has an iridium coating on the section (14a, 20) which contacts the glass and on the tank inlet (3a) and outlet (3b). The coated sections are heated. Independent claims are included for: (A) apparatus for carrying out the process comprising a tank as described; (B) use of iridium as a component of a layer for preventing bubble formation in glass refining tanks; and (C) optical glass produced using the method.