Patent ID: 8783065

Claim:
A method for bending and thermally prestressing radiation shielding glass, comprising the following steps: (a) providing a mold; (b) providing a glass plate comprising a radiation shielding glass; (c) preheating said mold to a temperature of 300 to 400° C.; (d) placing said glass plate on said mold; (e) heating said glass plate and said mold together to a temperature of 370 to 430° C.; (f) further heating to a temperature of 400° C. to 500° C., steps (e) and (f) together lasting for at least 30 minutes; (g) molding said glass plate into its final form; (h) cooling said glass plate after molding to a temperature of not more than 150° C. by means of a cooling program over a period of at least 60 minutes; (i) removing the glass body from the mold; and thereafter thermally prestressing the radiation shielding glass by: (j) supporting said glass body at a plurality of support points including at least at its outer periphery and at an intermediate point; (k) introducing said glass body into a furnace which has been preheated to a temperature of 500 to 600° C.; (l) heating said glass body to 400° C. to 500° C.; (m) removing said glass body from said furnace; and (n) blowing a cold fluid onto said glass body on both sides from a plurality of nozzles until said glass body has cooled to a surface temperature of not more than 150° C.