Round Bottom Flask Two Neck Jointed

Round Bottom Flask Two Neck Jointed refers to BORO 3.3 glassware designed for heating, mixing and connecting multiple laboratory components in one setup.Its two-neck jointed design supports controlled reactions, reflux, distillation and addition workflows where secure glass connections are required.Australian laboratories, universities and research facilities use two-neck round bottom flasks for reliable organic chemistry, synthesis and analytical preparation work.
This product has multiple variants. The options may be chosen on the product page Select optionsThis product has multiple variants. The options may be chosen on the product page
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Round Bottom Flask Two Neck Jointed BORO 3.3 Glass

From $19.90 (Ex GST)

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Round Bottom Flask Two Neck Jointed, BORO 3.3 Glass is designed for heating, mixing and carrying out reactions in connected laboratory glassware assemblies. Its spherical body promotes even heat distribution when used with a suitable heating mantle, bath or other compatible heat source, while the two-neck arrangement provides separate access points for attaching laboratory components.

The main neck can be used with a compatible condenser, distillation head or adapter. The second neck allows an additional component, such as a dropping funnel, thermometer adapter, gas inlet or reagent addition tube, to be fitted without removing the primary connection. The final arrangement depends on the experimental method, flask capacity, neck position and joint sizes.

Both necks feature ground-glass joints for connection with matching jointed apparatus. The joint dimensions must be checked before ordering because visually similar joints may not be interchangeable. ISO 383 specifies dimensions and tolerances for interchangeable conical ground joints, while ASTM E676 provides a recognised specification for taper-ground joints used in laboratory equipment.

The flask is manufactured from BORO 3.3 borosilicate glass, which is recognised for low thermal expansion and chemical durability under compatible laboratory conditions. Its clear construction allows users to observe boiling, mixing, colour change, precipitation, phase separation and other visible changes during a procedure. ISO 3585 defines the properties of borosilicate glass 3.3, while ASTM E438 covers glasses commonly used in laboratory apparatus.

Round-bottom flasks cannot stand securely on a flat bench without suitable support. The flask should be held with an appropriate clamp, flask stand or heating mantle, and connected glassware should be independently supported where necessary. Correct alignment helps reduce strain on the necks and ground joints, particularly when condensers, addition funnels or other components are attached.

Before use, the flask should be inspected for cracks, chips, scratches and damaged joint surfaces. Sudden temperature changes, uneven heating and mechanical impact should be avoided. The apparatus should not be operated as a sealed pressure system unless every component has been specifically designed and rated for pressure use.

ISO 4797 specifies requirements for laboratory boiling flasks fitted with conical ground joints and provides a relevant technical reference for this type of jointed flask. ISO 3585, ISO 383, ISO 4797, ASTM E438 and ASTM E676 should only be presented as confirmed product compliance claims when supporting manufacturer documentation is available.

For LabChoice Australia customers, Round Bottom Flask Two Neck Jointed, BORO 3.3 Glass provides a practical option for universities, research laboratories, chemistry teaching facilities, synthesis laboratories and quality control environments carrying out compatible reflux, distillation, reagent addition and reaction procedures.