250ml Filtering Flask, Each

Details

This heavy-wall borosilicate filtering flask features a heavy-duty rim and a bolt neck with tubulation. The graduations are printed in durable white enamel. Manufactured from low-expansion Type 1, Class A Borosilicate 3.3 glass, it complies with the ASTM E438 Standard Specification for Glasses in Laboratory Apparatus. This low-alkali glass has a typical chemical composition of approximately 81% silica, 13% boric oxide, 4% sodium oxide, and 2% aluminum oxide. It is virtually free of the magnesia-lime-zinc group and contains only traces of heavy metals.