These heat-resistant glass flasks are useable for most distillation procedures. The sidearm on all sizes, except the 125 ml, is approximately 77 mm below the top of the neck and is set at a 75° angle. Flasks are acceptable for use with thermometers calibrated for a 76 mm immersion. The sidearm of the 125 ml flask is approximately 137 mm from the bottom of the flask, meets ASTM E-133 requirements and is useful in ASTM D-86 and D-447. (ASTM D-86, D-447, E-133)