Corning Pyrex #4980-250
- 250 ml narrow mouth Erlenmeyer flask
- Rubber stopper included, single flask
- Borosilicate glass, round bottom
- 25 ml graduation interval
- Heavy duty rim to reduce chipping
Last refreshed Oct 3, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A quarter liter borosilicate Erlenmeyer flask with a stopper, a common bench size for mixing and light heating. Not for exact volumes.
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ASIN: B07D33Y38CModel: 4980-250(Flask-RS)Category: Erlenmeyer Flasks
Overview
Not a volumetric flask, this Pyrex Erlenmeyer has approximate white enamel graduations and a rubber stopper in the box. The heavy duty rim reduces chipping, and the walls are an even thickness throughout.
The reinforced rim and even walls help the flask last through repeated use and temperature changes. The listing gives neither dimensions nor weight.
Who it's for
Teaching and general lab users for mixing, swirling and storage. Accurate preparation calls for volumetric ware.
Pros and cons
- Rubber stopper in the box
- Extra large marking space
- Approximate scale only
- Dimensions not listed
- Stopper size not stated
Performance notes
A uniform wall spreads thermal stress, so heating and cooling are less likely to crack the glass. The conical shape lets liquid swirl without climbing out.
Specifications
| Model | 4980-250(Flask-RS) |
|---|---|
| Capacity & performance | |
| Capacity | 250 ml |
| Construction & materials | |
| Material | Borosilicate glass |
| Included components | |
| Included | Rubber stopper |
| Other details | |
| Bottom shape | Round |
| Graduations | 25 ml, approximate |
| Rubber Stopper | #06 |
Frequently asked questions
What is in the box with the Corning 4980-250?
The listing names one flask and a rubber stopper. It does not mention other accessories.
Does the 4980-250 have a wide mouth?
No. The title lists a narrow mouth flask.
What are the markings on the 4980-250 for?
They are approximate graduations in white enamel, with an extra large marking space for labels.