The Flask, Round Bottom, Narrow Neck, ISO engineered by Edulabs is designed for chemical boiling, thermal refluxing, solvent evaporation, and organic distillation processes. The classical spherical round-bottom geometry is specifically designed to distribute heat evenly across the entire submerged surface area. This uniform heat distribution eliminates localized hot spots that could otherwise lead to thermal stress, glass fracturing, or sample decomposition.

Fabricated from premium 33 expansion borosilicate glass, this flask strictly fulfills USP Type I and ASTM E438, Type I, Class A material standards. The controlled manufacturing process ensures precise wall thickness distribution across the spherical body and neck. This uniform wall thickness profile provides high structural stability and thermal shock durability, making the vessel suitable for immersion in heating mantles, oil baths, and sand baths during continuous boiling operations.

The narrow neck design reduces vapor loss during heating, directing vapors efficiently toward external condensers or reflux columns. The rim of the neck is finished with a heavy beaded rim, which strengthens the top opening against chipping and mechanical stress while offering a tight seal when fitted with rubber stoppers or flexible tubing. In addition, the borosilicate glass formulation provides near-universal chemical neutrality, resisting corrosion from strong acids, halogenated organic compounds, and basic solutions.

Conforming to international ISO guidelines, the Edulabs Narrow Neck Round Bottom Flask is available in an extensive range of capacities, starting from 50 ml for small-scale analytical preparations up to 20,000 ml for pilot plant and bulk solvent distillation setups. Edulabs provides robust, chemically pure laboratory glassware designed to deliver accurate results and safe performance.

Key Features

• Manufactured from 33 expansion borosilicate glass meeting USP Type I and ASTM E438, Type I, Class A requirements.

• Uniform wall thickness distribution provides optimal heat transfer and mechanical durability.

• Spherical round-bottom design ensures even thermal distribution without localized hot spots.

• Narrow neck minimizes vapor loss and directs vapors toward collection systems.

• Finished with a sturdy beaded rim to prevent chipping and ensure secure stopper fitting.

• Conforms to international ISO standards for laboratory glassware.

• Exceptional thermal shock resistance during heating and cooling cycles.

• High chemical resistance to concentrated acids, alkalis, and organic solvents.

• Ideal for heating, distillation, refluxing, and solvent recovery routines.

• Wide capacity range available from 50 ml to 20,000 ml.

Technical Specifications

Available Models

Applications

• Organic liquid boiling, heating, and distillation routines.

• Reflux reactions in organic synthesis and pharmaceutical R&D.

• Solvent recovery and evaporation setups in chemical testing labs.

• Sample digestions requiring uniform thermal distribution.

• Heating mantle reactions across university research laboratories.

• Environmental water sample concentration and testing.

• Essential oil distillation and plant extract concentration.

• Petrochemical sample distillation and constituent analysis.

• Large-scale batch boiling in pilot plant operations (10,000 ml & 20,000 ml models).

• General wet chemical heating operations on water or oil baths.

Note

Edulabs also offers a comprehensive range of laboratory glassware, laboratory plasticware, laboratory chemicals, laboratory instruments, laboratory equipment, scientific apparatus, educational laboratory equipment, and customized laboratory solutions for educational institutions, research laboratories, pharmaceutical industries, healthcare facilities, biotechnology laboratories, environmental testing laboratories, food and beverage laboratories, and industrial quality control laboratories. Contact Edulabs for bulk orders and OEM requirements.