Flask, Conical (Erlenmeyer), Assorted

Quick Answer: Assorted conical flasks are a mixed selection of Erlenmeyer flasks of different capacities supplied under one listing. The flat base, conical body and narrow neck are the same across the range; what varies is the volume, so each size can be matched to a particular task.

Matching Flask Size to the Job

A laboratory rarely needs only one size of conical flask. Small flasks hold the aliquot in a titration, medium flasks carry solutions being warmed or mixed, and larger ones hold stock media or rinse water. Buying an assortment lets a new laboratory, a practical examination centre or a teacher’s demonstration kit cover these tasks without ordering each size separately.

This listing does not specify which capacities are included or how many of each, so the mix should be agreed before ordering. A practical way to plan it is to list the experiments in the syllabus and note the volume each one uses; the flask chosen should normally be two to four times that working volume, which leaves space for swirling and prevents boil-over.

For repeat orders of a single capacity, the standard Erlenmeyer flask listing is usually the better route. Glass type and neck finish are not given here either and should be confirmed along with the size mix.

Applications

• Smaller flasks for pipetted aliquots in acid-base and redox titrations
• Mid-size flasks for dissolving solids, warming solutions and crystallisation
• Larger flasks for preparing stock solutions, culture media and wash water
• Stocking a teaching laboratory or a mobile science kit that must cover several practicals

Specifications

Care & Handling

• Shelve each size in its own marked section so small flasks are not crushed beneath larger ones and students return them to the right place.
• Inspect the whole assortment at the end of each term and replace chipped or cracked flasks individually rather than reordering the full set.
• Match bungs and foam plugs to each size before a practical, since neck diameters differ across the range.
• Heat any size gradually and keep boiling liquids below half of the flask’s capacity.

Why Choose LabEquip

Schools setting up a laboratory and colleges replacing breakage across several practicals find a mixed order simpler to manage than many single-size orders. LabEquip can make up the assortment from its chemistry lab equipment range to suit your syllabus; list the capacities and counts through the contact page.

Frequently Asked Questions

Which conical flask size is most used in school titrations?

Flasks of roughly 100 to 250 millilitres are the usual choice, because the pipetted aliquot is typically 10 to 25 millilitres and the flask needs room for indicator, washings and swirling.

Can I choose the sizes in an assorted set?

The listing does not fix the mix, so tell LabEquip the capacities and numbers you need. A common starting mix for a teaching lab is weighted towards titration sizes, with fewer large flasks for stock solutions and media.

Why buy an assortment instead of single sizes?

An assortment covers several practicals from one order and is convenient when setting up a new lab or examination centre. Once usage is known, restocking the most-used size individually saves glass and storage space.

Do all sizes in the set have the same neck width?

Not necessarily. Neck diameter usually grows with flask capacity, so a bung or plug that fits a small flask will not fit a large one. Check neck sizes before ordering stoppers or foam plugs for the set.

How full should each flask be filled?

For swirling and titration keep the liquid well below the shoulder; for boiling, fill to no more than half. For shaken liquid cultures, about a fifth of the nominal volume leaves room for air exchange at the surface.

How do I tell the sizes apart quickly?

Nominal capacity is normally marked on the flask body. Grouping sizes on separate labelled shelves or in marked trays saves time when a class is collecting and returning glassware.

Last Updated: September 2026