With a typical content of 25% PbO, this type of glass is usually melted in small electric furnaces with melting areas between 8 and 30m².
Crystal symbolizes the beauty and purity of glass, therefore the main requirements for melting lead crystal glass are :
- A totally defect-free glass transparency is an absolute necessity. The absence of blisters or cristallized defects (leucite-ZrO2) is compulsory.
- Corrosion resistant refractories, particularly for the bottom zones, that are subjected to heavy wear by Lead, either in the form of metal or in the form of dissolved oxide.
Saint-Gobain SEFPRO provides glass makers with materials and solutions answering these specific constraints.
These solutions include for instance :
- ER 1195 RT and Scimos UZ, high zirconia fused-cast refractories material for the bottom and electrode banks. Its outstanding resistance to lead oxide penetration and very low potential for generating glassy knots are extremely important for lead crystal glass quality,
- JARGAL M for distributors, working-ends and feeder channels, due to its low blistering levels and high purity,
- Routine diamond grinding of most joints, with joints smaller than 0.5 mm, securing minimal glass penetration
- A full range of unshaped materials.
Benefit from Saint-Gobain SEFPRO glass Defect Analysis Service and optimize your operation and glass quality !