- Evaporating Flask (NS 24/40):
- NS (Normschliff): Indicates a standard interchangeable tapered ground glass joint.
- 24: Specifies the outer diameter of the widest part of the inner joint (in millimeters).
- 40: Specifies the length of the ground zone zone (in millimeters).
- Application: This pear-shaped or round-bottom flask attaches directly to the rotary evaporator’s vapor tube drive shaft to hold the solvent mixture.
- Receiving Flask (KS 35/20):
- KS (Kugelschliff): Indicates a standard spherical (ball-and-socket) ground glass joint.
- 35: Specifies the nominal outer diameter of the ball portion (in millimeters).
- 20: Specifies the internal diameter of the tubing bore (in millimeters).
- Application: This round-bottom flask collects the condensed distillate at the base of the condenser assembly. The spherical joint allows rotational movement to easily adjust the positioning of the collection flask and withstand vacuum pressures under clamping.
If you are looking to purchase or replace these items, they are typically sold bundled together as part of a vertical or diagonal condenser glassware set.
Are you replacing parts for a specific brand of rotary evaporator? If you share the brand or the volume of the flask you need (e.g., 500 mL, 1000 mL), I can provide direct links to compatible replacement parts.
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