250 ml spherical flask, round bottom and standard ground joint

Instrument for distillation and boiling processes, for the uniform scalding of the substances contained in it, for sweeping substances, among other uses. Basic laboratory material for schools, colleges and universities.
Made of borosilicate glass 3.3 according to DIN 12347, ISO 4797 and USP standard of the Glassco brand.
White silkscreen with writing area.

General properties of borosilicate glass 3.3

This glass is distinguished by its very good chemical resistance to water, salt solutions, acids, bases and organic solvents. It is only attacked by hydrofluoric acid and, at high temperatures, by strong bases and phosphoric acid.

Chemical composition
80.00% Silica; SiO₂
12.50% Boron trioxide; B₂O₃
2.40% of Aluminium oxide; Al₂O₃
3.80% of sodium oxide; Na₂O
1.00% of potassium oxide; K₂O
0.30% of iron oxide; Fe₂O₃

Chemical resistance
Hydrolytic according to DIN 12111 and ISO 719: Class 1
Acid-resistant according to DIN 12116: Class 1
Alkaline according to DIN 52322 and ISO 695: Class 2

Physical properties:
Coefficient of linear expansion: 3.3
Processing temperature: 534° C
Upper annealing temperature: 550° C
Lower annealing temperature: 494° C
Maximum working temperature: 500° C

See all Spherical Flasks