Quick Answer:The Round Bottom Flask is a narrow-neck round bottom flask in borosilicate glass, graduated and resistant to heat and chemicals, made in 50 ml, 100 ml, 250 ml, 500 ml and 1000 ml sizes.
Last updated: 18 October 2026
Key Features
Round bottom with a narrow neck.
Borosilicate glass, heat and chemical resistant.
Graduated.
Five capacities from 50 ml to 1000 ml.
Technical Specifications
Specification
Value
Material
Borosilicate glass
Type
Round bottom, narrow neck
Capacities
50 ml, 100 ml, 250 ml, 500 ml, 1000 ml
Graduation
Graduated
How It Is Used
Because of its round base the flask is held in a clamp or set on a ring while it is heated. It is used in the chemical laboratory for heating and boiling liquids, for example under a condenser for reflux or distillation.
Frequently Asked Questions
What sizes is the Round Bottom Flask made in?
Five sizes: 50 ml, 100 ml, 250 ml, 500 ml and 1000 ml, all with a narrow neck.
Related Lab Glassware
See the full lab glassware range, or these related round bottom flasks and fittings:
