LX Premium X-Ray Shielding Lead Glass is the next generation of radiation shielding glass with excellent impact resistance. It is unparalleled radiation protection and superb visual clarity. Conventional lead glass products have had problems with staining and discoloration when moisture adheres to the glass surface. LX Premium has a multilayer structure, created by inserting LX-57B high-lead glass between two panels of protective sheet glass. LX Premium is high quality optical grade, lead barium type, X-Ray Shielding Lead Glass that consists of over 60% heavy metal oxide that includes a minimum of 55% Pbo. LX Premium comes in three thicknesses: LX12.