Erlenmeyer Flask

What is the Erlenmeyer Flask?

An Erlenmeyer flask is a conical flask with a flat base and narrow neck that mixes without spilling. It is used for titration, culture and heating with reduced splash risk, for titration, culture and heating.

Overview

The flask has a conical body, a flat base and a narrow neck, so swirling mixes the contents with less risk of splashing than a beaker, and the neck accepts a stopper or a foam plug. Capacities range from 25 mL to 5000 mL, and graduation marks are approximate. Borosilicate 3.3 construction allows heating and autoclaving, and narrow-neck flasks are used for titrations where the indicator endpoint must be observed, and for microbial culture where the surface area to volume ratio matters for aeration. Baffled versions improve mixing for cultures, and screw-cap versions allow sealed storage and safe transport. The flask is not used for accurate volume measurement, though some are calibrated to contain or deliver for specific methods.

How does it work?

Laboratory glassware works because borosilicate 3.3 is chemically inert, transparent and resistant to heat and thermal shock. Its low coefficient of expansion, about 3.3 × 10⁻⁶ per kelvin, means it tolerates rapid temperature change without cracking, and it resists attack by most acids, solvents and reagents, so it does not contaminate samples or react with them. Volumetric glassware carries a calibration mark and is made to defined tolerances: Class A flasks and pipettes hold or deliver a stated volume at 20 °C within a tight limit, while Class B allows a wider tolerance for less critical work. Graduations on cylinders and beakers are approximate. Ground joints and stoppers seal by friction, and standard tapers allow interchange. Because glass is brittle, care is needed with impact and with hydrofluoric acid and hot alkalis, which attack it.

What are the key features?

• Conical body with flat base and narrow neck
• Capacities 25–5000 mL
• Borosilicate 3.3 for heating and autoclaving
• Approximate graduations
• Stopper, screw cap or foam plug
• Baffled option for culture mixing

What are the technical specifications?

A typical erlenmeyer flask configuration offers material of Borosilicate 3.3, capacity range of 25–5000 mL, neck of Narrow or wide, closure of Stopper, screw cap or plug, graduation of Approximate and autoclavable of Yes. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Erlenmeyer Flask is used in titration, microbial culture, solution heating and mixing and sample storage with cap. Across the wider Glassware class, laboratories also deploy it for standard and reagent preparation, titration and volumetric analysis and sample mixing and heating.

Which standards and certifications apply?

Relevant standards and methods include ISO 3585 (borosilicate glass 3.3), ISO 1042 (one-mark volumetric flasks), ISO 385 (burettes), ISO 4788 (graduated measuring cylinders), ASTM E438 (glass composition) and USP <660> (glass containers). Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Clean glassware thoroughly, using a detergent suited to the residue and rinsing with reagent water, since residual detergent or acid affects results. Avoid abrasives and strong alkalis that etch glass and remove graduation marks, and never use hydrofluoric acid in glass. Dry volumetric glassware by air or with solvent rather than heat, because heating changes the calibrated volume. Handle ground joints carefully, store stoppers loosely or with a spacer and avoid seizing by keeping joints clean. Check for chips, cracks and star cracks before use, since damaged glassware can fail under vacuum or heat. Keep the calibration certificate and recheck or replace volumetric items that are damaged or of unknown history.

How do I select the right Erlenmeyer Flask?

Choose an Erlenmeyer flask for titrations and culture, and use a dedicated volumetric flask for accurate volumes. Confirm capacity, neck and closure. RFQ: capacities, closure type, baffled option and autoclave needs. Provide capacities and closure type.

How does it compare with other Glassware variants?

Choose the item by function and accuracy. Use Class A volumetric flasks and pipettes where the volume must be accurate, for standards, dilutions and titrations, and Class B or graduated items for approximate work. Select the material for the chemistry: borosilicate 3.3 for general laboratory use, and avoid glass for hydrofluoric acid, hot concentrated alkali and some fluoride-containing reagents, where plastic is safer. Match capacity and neck size to the application, and use narrow-neck flasks for mixing and wide-neck for solids. Check that graduations are legible and durable when buying, and confirm the calibration certificate for volumetric items. Consider whether low-extractable or amber glass is needed for light-sensitive or trace work, and plan cleaning and drying that will not damage the marks.