Stonylab Glass 24/40 Erlenmeyer Flask 100 ml - Heavy Wall Laboratory

In this review of the Stonylab Glass 24/40 Erlenmeyer Flask the bottom line is simple: this is a reliable, modestly priced borosilicate flask for routine lab work that needs a standard taper joint and a glass stopper. Practical for general chemistry tasks, the flask's heavy wall construction and standard 24/40 outer joint make it suitable for repeating reactions, storage, and sample collection where a glass stopper is preferred over a screw cap. Our review finds it most useful for small-scale lab setups and educational use where durability and compatibility with 24/40 glassware are priorities.

Key Features

• 24/40 standard taper joint: The outer joint accepts common 24/40 inner joint glassware, making it easy to integrate with condensers, adapters, and other lab glass components.
• Glass stopper included: The included glass stopper provides a tight, solvent-resistant closure ideal for short-term storage and preventing evaporation.
• Borosilicate glass construction: Made from heat- and chemical-resistant borosilicate, the flask tolerates routine thermal and chemical exposure better than ordinary glass.
• Heavy wall design: The thicker walls increase mechanical durability for everyday handling in teaching labs or benchwork.
• Recommended vacuum limit: The manufacturer advises a pressure resistance down to -0.065 MPa, which guides safe use under light vacuum conditions and helps avoid over-stressing the glass.
• One-year warranty: A 1-year coverage period offers recourse if the product arrives damaged or defective, which adds confidence at purchase.

Who It's For

The Stonylab 24/40 Erlenmeyer flask is best for students, hobbyist chemists, and laboratory technicians who need a compact, compatible piece of glassware for mixing, storing, or carrying out small reactions. Its 24/40 outer joint and glass stopper make it particularly handy where a fully glass setup is desired and where adapters or condensers are used.

It is less suitable for applications that require heavy vacuum use or scaled-up production; users who need deep vacuum capability or very large volumes should look for thicker-walled vacuum-rated vessels or purpose-built reaction flasks with appropriate certification.

Pros & Cons

Pros

• Durable borosilicate construction gives good chemical and thermal resistance for routine lab tasks.
• Standard 24/40 outer joint increases compatibility with common lab glassware and accessories.
• Included glass stopper offers a solvent-resistant seal for short-term storage and sample handling.
• Heavy wall provides extra protection against accidental impact during everyday use.

Cons

• Not rated for strong vacuum beyond the recommended -0.065 MPa, so it should not be used under heavy vacuum conditions.
• Capacity is modest at 100 ml, so larger-scale work will require different flasks.

Specifications

Product type	Erlenmeyer flask with stopper
Capacity	100 ml
Material	Borosilicate glass
Joint size	24/40 standard taper outer joint
Recommended pressure resistance	-0.065 MPa
Pack quantity	1 pack
Warranty	1-year coverage

Our Verdict

The Stonylab 24/40 Erlenmeyer Flask is a solid choice for general laboratory and educational use where compatibility with common 24/40 glassware and a glass stopper are important. It is good value for users needing a reliable 100 ml borosilicate flask with extra wall strength and a warranty, but those needing deep vacuum capability or larger volumes should consider other options.

Frequently Asked Questions

Is this flask safe for heating?
The borosilicate construction tolerates routine heating and thermal changes common in bench chemistry, but avoid rapid extreme temperature shocks.

Can it be used under vacuum?
It can handle light vacuum down to the recommended -0.065 MPa but is not intended for strong vacuum applications.

What if it arrives damaged?
The product includes a 1-year warranty; contact the seller promptly and they will resolve damaged or defective items.