Polystopper 12/21 for Volumetric Flasks & Laboratory Glassware

Polystopper 12/21 is a reusable laboratory stopper designed to fit volumetric flasks and other laboratory glassware requiring a 12/21 stopper size. It is suitable as a replacement stopper for compatible glassware used in school, tertiary and general laboratories.

The 12/21 designation refers to the dimensions of the tapered stopper cone: approximately 12mm diameter at the top of the taper and 21mm tapered length. The octagonal top is not included in these measurements.

Key Features

• 12/21 polystopper for compatible laboratory glassware
• Suitable as a replacement stopper for volumetric flasks
• Reusable laboratory accessory
• Octagonal top provides a convenient grip
• Suitable for school, tertiary and general laboratory use

Specifications

• Stopper size: 12/21
• Diameter at top of tapered cone: Approximately 12mm
• Tapered cone length: Approximately 21mm
• Measurements exclude the octagonal top

Compatibility

• 50mL Volumetric Flask – 49FV50
• Other laboratory glassware designed to accept a 12/21 stopper

Important Note

Check the stopper size of your glassware before ordering. The 12/21 measurement refers to the tapered fitting size and does not represent the overall dimensions of the stopper.