Corning Pyrex 25x200 mm Heavy Wall Rimless Ignition Tube

(This is the suggested replacement for 9820-20 and 9860-18)

These 25x200mm PYREX ignition tubes are made from No. 7740 glass and are satisfactory for most applications encountered in school work where temperatures above 600°C are not required. These rimless tubes perform well when continually used at temperatures up to 500°C, or for short periods to 600°C.