DURAN 217213604 Round Bottom Flask 250 mL Narrow Neck Beaded Rim
The DURAN 217213604 is a 250 mL round-bottom flask made from DURAN® borosilicate glass 3.3, engineered for high durability, excellent chemical resistance, and reliable thermal performance. Its round-bottom design ensures even heat distribution, making it ideal for processes such as boiling, reflux, and distillation.
The narrow mouth is strengthened with a beaded rim, which enhances mechanical stability and minimizes the risk of chipping during frequent handling or washing. The flask complies with DIN ISO 1773 standards, ensuring laboratory-grade performance and compatibility. It is autoclavable at ~121 °C, making it suitable for repeated use in sterile environments.
Key Features
Premium DURAN® Borosilicate Glass 3.3: High resistance to thermal shock and chemical attack
Round Bottom Design: Enables consistent and even heating
Narrow Neck with Beaded Rim: Enhanced strength and chip resistance
Standard-Compliant: Manufactured according to DIN ISO 1773 for laboratory use
Autoclavable (~121 °C): Suitable for steam sterilization and reuse
Laboratory Pack: Typically supplied in sets of 10 for efficient stocking
Technical Specifications
Catalogue Number: 217213604
Nominal Capacity: 250 mL
Material: DURAN® Borosilicate Glass 3.3
Neck Type: Narrow mouth with beaded rim
Body Outer Diameter: ~85 mm
Height: ~144 mm
Bottom Type: Round bottom
Standard Compliance: DIN ISO 1773
Autoclavable: Yes (~121 °C)
Packaging: Pack of 10 units
Applications
Reflux and Distillation: Ideal for procedures needing uniform heating
Boiling or Heating Liquids: Compatible with heating mantles or baths
Synthesis and Reaction Setups: Trusted vessel for organic chemistry workflows
Education and Research: Widely used in teaching labs and pilot research facilities
Sterile Environments: Suitable for repeated sterilization cycles
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