R/B BOIILING FLASK

Description

A Round Bottom (R/B) Boiling Flask, often referred to as a “Florence Flask” or “Spherical Flask,” is the workhorse of organic chemistry and distillation. Its unique spherical shape is engineered for high-stress environments, providing superior resistance to heat and pressure compared to flat-bottomed alternatives.

Key Product Features

• Superior Heat Distribution: The spherical body allows heat to circulate evenly throughout the liquid. This prevents “hot spots” and minimizes the risk of thermal shock or “bumping” (sudden, violent boiling).

• High Structural Integrity: Because it h

• as no flat surfaces or sharp angles, it distributes mechanical stress evenly. This makes it the only safe choice for vacuum-distillation and applications involving internal pressure.

• Borosilicate 3.3 Material: Highly resistant to chemical erosion and capable of withstanding temperatures up to 500°C. It features a very low coefficient of thermal expansion.

• Neck Variations:

  • Plain Neck: Features a reinforced beaded rim for use with rubber stoppers.

  • Ground Glass Joint: Features a precision-ground joint (e.g., 24/29 or 29/32) to create an airtight, grease-free seal with condensers, separatory funnels, or fractionating columns.

Technical Specifications

Primary Applications

• Distillation & Reflux: Used as the primary heating vessel where vapors are generated and then cooled in a condenser.

• Evaporation: Often used in Rotary Evaporators (Rotovaps) to remove solvents from samples under reduced pressure.

• Chemical Synthesis: Ideal for long-duration reactions that require constant heating (boiling) and stirring.

• Vacuum Applications: Safely holds contents under vacuum conditions where a flat-bottom flask might implode.

Support & Handling

• Support Requirements: Since the flask cannot stand upright, it must be supported by:

  • Cork/Rubber Rings: For resting on a lab bench.

  • Heating Mantles: Which wrap around the sphere for precise, even temperature control.

  • Clamps: To secure the neck to a retort stand.

• Safety Tip: When heating a round-bottom flask over a direct flame (Bunsen burner), always use a wire gauze or a sand bath to further diffuse the heat.

Why Choose R/B over F/B?

While Flat Bottom (F/B) flasks are convenient for sitting on a hotplate, the Round Bottom (R/B) is the professional choice for serious chemistry. Its ability to handle vacuum pressures and its shatter-resistant geometry make it indispensable for any procedure involving distillation or high-intensity thermal reactions.