Borosilicate Conical Flask 250ml

Quick Answer

This 250ml borosilicate conical flask, also called an Erlenmeyer flask, has a flat base and sloped sides narrowing to a neck, a shape that makes it easy to swirl during titrations while also allowing controlled heating and mixing on the bench.

Description

The conical or Erlenmeyer shape is one of the most recognisable pieces of borosilicate laboratory glassware, and its sloped sides serve a real purpose: they let a technician swirl the liquid inside to mix a reaction or dissolve a solid without the risk of splashing that a straight-sided vessel would carry. As a piece of borosilicate glassware, it also tolerates the thermal stress of gentle heating better than ordinary glass.

Because of this combination of stability and easy swirling, the 250ml conical flask is the standard receiving vessel for titrations, where the analyte solution sits in the flask while titrant is added from a burette above it. The narrow neck also reduces evaporation and splashing compared with an open, wide-topped vessel of similar capacity.

Specifications

Applications

• Receiving vessel for titrations, where swirling the solution by hand is easy without spilling
• Heating or gently boiling liquids where controlled evaporation matters
• General mixing and reaction vessel in a teaching or analytical laboratory
• Holding culture media or solutions where a narrow neck reduces contamination risk

Care & Handling

• Swirl gently by hand while titrating, holding the neck rather than the base
• Allow the flask to cool gradually after heating to avoid thermal shock
• Clean and rinse thoroughly between uses, especially before a titration where residue could affect the result
• Confirm the correct stopper size at enquiry if you plan to fit one for shaking or short-term storage
• Check the base and neck for chips regularly, since both are common stress points on conical glassware

Why Choose LabEquip

As genuine borosilicate laboratory glassware, this conical flask is part of our full lab glassware range, ready to pair with burettes and pipettes for a complete titration setup. Browse further apparatus in our chemistry lab equipment catalogue, and contact us for bulk laboratory orders.

Frequently Asked Questions

What is a 250ml conical flask used for?

It is most often used as the receiving vessel in a titration, and more generally for mixing, heating, and holding liquids wherever its sloped sides and narrow neck are useful for swirling without spilling.

Why is this flask made from borosilicate glass?

Borosilicate glass resists thermal shock better than ordinary glass, which matters for a flask that is regularly heated gently on a hot plate or over a low flame during laboratory work.

Can this flask be heated directly?

Borosilicate conical flasks can generally tolerate gentle, even heating better than ordinary glass, though a stand or wire gauze should still be used and the flask allowed to cool gradually afterwards.

Why is the conical shape useful for titrations?

The sloped sides let you swirl the solution inside by hand to mix in the titrant as it is added from the burette, without the liquid splashing out the way it might from a straight-sided vessel.

Can I fit a stopper to this flask?

Yes, a stopper sized to the neck can generally be fitted for shaking or short-term storage; confirm the exact stopper size you need at the time of enquiry.

Can LabEquip supply conical flasks in bulk for a laboratory?

Yes, LabEquip supplies borosilicate conical flasks in bulk for schools, colleges, and laboratories; contact us with your required quantity.

Last Updated: September 2026