This non-sterile PYREX® heavy wall rimless ignition tube has an outer diameter of 25mm and a length of 200mm. It is made from borosilicate glass Code 7740 and is satisfactory for most applications encountered in school work where temperatures above 600°C are not required. This rimless tube performs well when continually used at temperatures up to 500°C, or for short periods to 600°C. Not Graduated. Non-Sterile. Reusable. Material: Borosilicate Glass Code 7740. Tube Style: Ignition. Top Style: Plain. Graduations: No. Cap Style: No Cap. Stopper Style: No Stopper. Outer Diameter: 25mm. Length: 200mm. Corning® #: 9860-25.