Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.

Sidearm tube is sealed at an angle of 75° from the neck and is 137 ± 3 mm from the bottom of the flask.

26016-125 version has 3 reference lines and is for use with Haage automatic distillation apparatus or others that call for three thermometer depth insertions.

Intended for ASTM D86, D233, D801, and D802.