Volumetric Flask
Volumetric flasks are a staple for precision liquid handling in analytical, pharmaceutical, and QC laboratories. Each Borosil Scientific calibrated volumetric flask offers traceability and compliance with international standards. Made from chemically resistant borosilicate glass, Borosil Scientific’s volumetric flasks meet ASTM, USP, and ISO standards with calibrated precision, batch traceability, and QR code validation where required.
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5655D – Volumetric Flask
With QR code, Class A, USP, Narrow Mouth, Amber, with Individual Calibration Certificate Neck size as per ISO (Long Neck)View Details -
5645D – Volumetric Flask
With QR code, Class A, USP, Narrow Mouth, Clear, with Individual Calibration CertificateView Details -
5653 – Volumetric Flask
With QR code, Class A, Wide Mouth, Amber, with Individual Calibration CertificateView Details -
5643 – Volumetric Flask
With QR code, Class A, Wide Mouth, Clear, with Individual Calibration CertificateView Details -
5648 – Volumetric Flask
With QR code, Class A, Narrow Mouth, Amber, with Individual Calibration CertificateView Details -
5640 – Volumetric Flask
With QR code, Class A, Narrow Mouth, Clear, with Individual CalibrationCertificateView Details -
Glass Stoppers – Penny head
ISO / DIN, Penny head, long-neck & short-neck, Clear & AmberView Details -
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What is a Volumetric Flask?
A volumetric flask is a laboratory-grade container with a flat bottom, long neck, and precise graduation mark. It is intended for the preparation of solutions at a fixed volume. The design provides accurate dilution and solution consistency.
| Feature | Description |
| Material | Borosilicate Glass, Amber or Clear |
| Neck | Long or Bulgy (ASTM/ISO) |
| Mouth | Narrow or Wide |
| Class | Class A (individual certificate), Class B (batch accuracy) |
| Markings | Permanent graduation line |
Borosil Scientific’s 5657, 5647, and 5655 series are manufactured as per ASTM standards, while 5657D, 5647D, and 5655D follow USP/ISO specifications. Flasks with QR codes make sure each unit’s calibration data is digitally traceable and suitable for GMP, GLP, and audit-aligned workflows.
Types and Classes of Volumetric Flasks
The choice of volumetric flask depends on application-specific requirements such as light sensitivity, reagent volatility, or volumetric class tolerance.
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Class A Volumetric Flasks: These have higher precision individual calibration certificates used in regulated environments.
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Class B Volumetric Flasks: These are suitable for general laboratory applications, cost less, and are batch-certified.
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Wide Mouth vs Narrow Mouth: Wide-mouth flasks (e.g., 5657, 5657D) facilitate ease of filling viscous liquids or powdered solutes. Narrow mouth types (e.g., 5645, 5645D) reduce evaporation and exposure.
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Amber vs Clear: Amber models (e.g., 5648, 5655D) offer UV protection for photosensitive samples.
| Product Code | Class | Mouth | Colour | Compliance | QR Code | Calibration |
| 5645 | A | Narrow | Clear | ASTM | Yes | Individual |
| 5655 | A | Narrow | Amber | ASTM | Yes | Individual |
| 5657D | A | Wide | Amber | USP/ISO | Yes | Individual |
| 5643 | A | Wide | Clear | ASTM | Yes | Individual |
| 5649 | B | Narrow | Amber | Batch | No | Batch-based |
Each flask goes through thermal stress testing and leachability analysis as per ISO 4796. The tolerance limits for Class A flasks are strictly within ±0.03 mL for a 10 mL volumetric flask, scaling proportionally with size.
How to Use a Volumetric Flask?
Correct usage is very critical when it comes to volumetric flasks. Each operation stage, from filling to meniscus alignment, affects solution accuracy. Borosil Scientific’s flasks feature narrow calibrated necks to enhance visual precision.
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Pre-rinse: Condition the flask with the intended solvent or solution to neutralise surface effects.
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Solute Addition: For solid solutes, wide-mouth designs like 5647D offer better access and stirring.
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Solvent Fill: Add the solvent until near the mark. Swirl gently to dissolve.
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Meniscus Matching: Top up to the calibration line using a dropper. Match the meniscus to the line at eye level.
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Final Inversion: Cap and invert multiple times. Borosil Scientific flasks have mechanically polished stoppers to ensure a snug fit without chemical interference.
| Step | Borosil Design Support |
| Meniscus Readability | Calibrated neck for clear line of sight |
| Inversion Safety | Chemically inert stopper with taper-fit |
| Traceability | QR code linked to the digital certificate |
Routine tasks like sugar estimation (e.g., 5650) or titration standards demand repeatable volume accuracy. Borosil Scientific offers special edition flasks tailored for these tasks.
Size of Volumetric Flasks
Volume needs differ by process stage. Standard sizes range from 5 mL to 2 L, with 10 mL volumetric flasks and 100 mL being common for high-precision applications.
| Capacity | Accuracy (Class A) | Common Use |
| 10 mL | ±0.03 mL | Analytical standards |
| 100 mL | ±0.08 mL | QC prep, reagent dilution |
| 1L | ±0.3 mL | Production scale solution |
Borosil Scientific’s wide range, like 5640, 5653, 5648, provides capacity flexibility with calibration traceability for each unit.
It is primarily used to prepare solutions of fixed volume with high precision. Each volumetric flask from Borosil Scientific is calibrated for solution prep in analytical and pharmaceutical labs.
Volumetric refers to accurate liquid measurement. A calibrated volumetric flask provides a defined volume for standard solution prep, titration, or QC analysis.
It holds and delivers specific volumes. Borosil Scientific flasks are designed to meet ISO and ASTM standards for high-integrity labs.
The narrow neck enhances precision in meniscus reading. In Borosil Scientific flasks, this design improves volumetric control and reduces evaporative loss.
To use a volumetric flask correctly, pre-rinse with solvent, dissolve the solute, fill near the mark, align the meniscus, and invert to mix. Borosil Scientific’s design supports this with fit-tested stoppers and certified marks.