Round Bottom Flask Two Neck Jointed BORO 3.3 Glass
From $19.90 (Ex GST)
- Restricted Item – EUD Required: For flask sizes 500 mL or larger, an End User Declaration (EUD) must be completed. A valid photo ID (such as a Passport, Driver Licence, or Proof of Age Card) is also required. Orders will not be shipped until all documentation is received and approved.
- Manufactured from high-quality BORO 3.3 low-expansion borosilicate glass
- Conforms to ISO 3585 requirements for borosilicate glass 3.3
- Meets ASTM E438 Type I, Class A laboratory glass quality requirements
- Two jointed necks allow simultaneous connection of compatible laboratory components
- Round-bottom design supports uniform heating and efficient liquid circulation
- Suitable for reflux, distillation, chemical synthesis and controlled reagent addition
- Provides strong chemical resistance, thermal stability and clear reaction visibility
- Description
Description
Round Bottom Flask, Two Neck Jointed, BORO 3.3 Glass, also known as a double-neck round-bottom reaction flask, is designed for laboratory heating, mixing, reflux, distillation and chemical reaction procedures requiring more than one connected component. The two-neck arrangement enables compatible jointed laboratory equipment to be installed simultaneously, providing greater flexibility when assembling reaction and separation systems.
The flask is manufactured from high-quality BORO 3.3 low-expansion borosilicate glass that conforms to ISO 3585 requirements for borosilicate glass 3.3. It also meets the glass quality requirements of ASTM E438 Type I, Class A, which classifies low-expansion borosilicate glass used in laboratory apparatus. These recognised ISO and ASTM glass standards define important material characteristics, including thermal expansion, chemical durability, density and temperature-related properties.
BORO 3.3 glass provides strong resistance to water, acids, saline solutions and many commonly used laboratory chemicals. Its low coefficient of thermal expansion supports reliable performance during controlled laboratory heating and cooling processes. As with all laboratory glassware, rapid or uneven temperature changes should be avoided to reduce thermal stress and protect the flask from damage.
The spherical body provides a large and evenly curved heating surface, helping distribute heat more uniformly than vessels with flat bases. This shape also promotes natural liquid circulation and efficient mixing when the flask is used with an appropriate magnetic stirrer, overhead stirrer, heating mantle, water bath or oil bath. The flask must be supported using suitable clamps because the round-bottom body cannot stand independently on a flat surface.
Its two jointed necks allow the user to configure the flask for more complex laboratory procedures. One neck may be connected to a condenser while the second accommodates a dropping funnel, thermometer adapter, gas inlet, vacuum adapter or another compatible jointed component. This makes the flask particularly useful for reflux reactions, controlled reagent addition, reaction temperature monitoring, distillation and procedures conducted under a controlled atmosphere.
The clear glass construction allows users to observe sample movement, boiling behaviour, colour changes, precipitation and other visible reaction stages. Before use, the flask should be inspected for cracks, chips, scratches or damaged joints. Joint sizes, flask capacity and accessory compatibility should be confirmed before assembling the apparatus, and all connected components should be properly clamped and supported.
LabChoice Australia supplies the Two Neck Jointed Round Bottom Flask for chemistry, research, education, industrial testing and general scientific laboratories requiring ISO and ASTM quality BORO 3.3 reaction glassware. Its low-expansion glass construction, versatile two-neck configuration and rounded heating surface make it suitable for dependable laboratory reaction, heating and separation workflows.
| Item Code | Nominal Capacity (ml) | Centre Socket | Side Socket | Approx. overall height (mm) |
|---|---|---|---|---|
| LC-03-RBFT221 | 100 | 24/29 | 24/29 | 100 |
| LC-03-RBFT222 | 250 | 24/29 | 24/29 | 140 |
| LC-03-RBFT223 | 500 | 24/29 | 24/29 | 163 |
| LC-03-RBFT224 | 1000 | 24/29 | 24/29 | 200 |
| LC-03-RBFT225 | 1000 | 34/35 | 24/29 | 200 |
| LC-03-RBFT226 | 2000 | 24/29 | 24/29 | 240 |
| LC-03-RBFT227 | 5000 | 24/29 | 24/29 | 260 |
| LC-03-RBFT228 | 10000 | 24/29 | 24/29 | – |
| LC-03-RBFT229 | 20000 | 34/35 | 34/35 | – |
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What Our Customers Say
⭐⭐⭐⭐⭐
We ordered a set of customised BORO 3.3 borosilicate glassware for our teaching labs, and LabChoice Australia exceeded every expectation. From the first consultation to final delivery, their team listened carefully, offered expert advice, and ensured every piece matched our specifications perfectly.
The clarity and precision of the glassware are exceptional, and the quick turnaround made setup effortless. It’s refreshing to work with an Australian supplier who genuinely understands laboratory needs and takes pride in quality craftsmanship. We’ll definitely be returning to LabChoice for future glassware requirements
⭐⭐⭐⭐⭐
Our lab required high-precision BORO 3.3 glassware for analytical testing, and LabChoice Australia delivered outstanding results. The ordering process was simple, communication was clear, and every beaker and flask arrived perfectly calibrated and ready for use.
The quality of the glass is exceptional — resistant to heat, easy to clean, and consistently accurate in measurement. It’s reassuring to know there’s an Australian supplier that combines scientific precision with genuine customer care. I’d recommend LabChoice to any research team looking for dependable labware
⭐⭐⭐⭐⭐
We needed a set of customised borosilicate glassware for a specialised project, and LabChoice Australia delivered exactly what we envisioned. The team worked closely with us from design to production, ensuring every detail met our specifications. The craftsmanship is exceptional, and the turnaround time was impressive. It’s reassuring to know we can rely on them for unique, made-to-order pieces
⭐⭐⭐⭐⭐
LabChoice Australia has completely changed the way we source our lab glassware. The quality is consistently top-notch, and every piece meets the precision we need for reliable results. Their team knows their stuff, answers our questions quickly, and always goes the extra mile to help — they’re more like partners than just a supplier.
⭐⭐⭐⭐⭐
We trust LabChoice Australia because they deliver every time. Their borosilicate glassware is durable, accurate, and perfect for the high-heat work we do. Everything arrives well-packed with clear specs, so there are never surprises. It’s reassuring to deal with a supplier who understands both compliance and the demands of a busy lab