100ml Glass Funnel Separating, 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