1,000ml Glass Separating Funnel, Straight Stopcock & PTFE Key

Made of borosilicate glass 3.3 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