PYREX® borosilicate glass, long neck.

• Have tooled finished necks for extra strength and uniform stopper fit
• Optimum balance between thermal shock and chemical resistance
• Can be used in ASTM E-258 procedure

Suitable for the determination of nitrogen. Care must be taken to ensure the bottoms of the flasks do not come in contact with the heating elements. Kjeldahl flask have ring supports for this purpose.