Kjeldahl flasks are subjected to extreme chemical and physical stresses. Therefore, the wall thickness should not be too thick to avoid overheating, which can lead to breakage due to remaining (permanent) stresses, on the one hand, and not too thin due to the noticeable glass removal in the alkaline medium, on the other hand.
Complies with ASTM Specification E147 (10 and 30 ml versions), and larger sizes comply with from ASTM Specification E1377, Type I requirements
Manufactured from borosilicate glass 3.3
KIMAX® flasks have a reinforced bead at the top.
The 500 and 800 mL sizes have tooled necks to provide an accurate stopper fit and to reduce the possibility of breakage in use
The 500 and 800 mL size necks are tooled to take rubber stoppers especially made for Kjeldahl flasks
