LEAD-FREE CRYSTAL ICE USED TO MAKE DECORATIVE SHEET GLASS, AND PRODUCTION METHOD THEREOF Russian patent published in 2011 - IPC C03C17/02 

FIELD: chemistry.

SUBSTANCE: invention relates to crystal ice as frit used for decorating sheet glass. Basic materials of frit glass are sprayed onto the surface of sheet glass. Crystal ice is molten at burning temperature between 650°C and 710°C. The average particle diametre of the crystal ice is between 0.2 mm and 1.0 mm. The crystal ice contains the following, mol %: Na₂O - 10-20, ZnO - 10-30; B₂O₃-20-40; SiO₂ - 10-20; TiO₂ - 0-5; ZrO₂ - 0-5; Al₂O₃ - 0-5; K₂O - 3-10; Mg - 5-10; CaCO₃ - 3-10; Nd - 0-5; F - 0-5, or Na₂O - 10-20, ZnO - 0-10; B₂O₃ - 20-40; SiO₂ - 10-30; CaO - 5-10; Al₂O₃ - 0-5; BaO - 3-10; SrO - 0-5; Li₂CO₃ - 0-5; Fe₂O₃ - 0-3; ZrO₂ - 0-3, or Na₂O - 10-20, ZnO - 5-15; B₂O₃ - 20-40; SiO₂ - 10-30; CaO - 3-10; Al₂O₃ - 0-3; BaO - 0-5; Li₂CO₃ - 0-3; SrO - 0-5.

EFFECT: reduced deformation and decolouration of crystal ice.

6 cl, 6 tbl