Acid and heat treatment to reduce lead leaching from cathode ray tube funnel glass

The effect of acid and heat treatments on chemical durability was investigated for cathode ray tube (CRT) funnel glass. The acid and post-heat treatment suppressed the lead leaching from the CRT funnel glass in an acid solution remarkably due to the formation of a silica-like surface layer. Pb ions were, however, easily leached into alkaline solution after the acid and post-heat treatment. In addition, the dependencies of acid resistance on the conditions of acid treatment and on the temperature of heat treatment were investigated.