Temperature of glass bead sterilizer is
Glass bead (hot salt) sterilizers used to consist of either hot salt or glass beads as a medium for dry heat sterilization. 
The temperature range employed was between 425°F (218°C) and 475°F (246°C) for 5 seconds.
Ref :Grossman’s endodontics, 13th edition , pg no:198
425°F-475°F for 5 secs
475°F-525°F for 5 secs
425°F-475°F for 10 secs
475°F-525°F for 10 secs