Product Description
Accurate standards and reagents start with a flask you can trust to hold exactly the volume on the line. These Class A volumetric flasks give analysts a crisp, uniform fill mark and a tight-fitting glass stopper, so solutions can be made up precisely and mixed by inversion without leaks.
This listing is for catalog number 2306A-250: Volumetric Flask, Class A, Glass Stopper, 250 mL, Pack of 4. Bodies are machine-blown from borosilicate glass with a low coefficient of expansion, and heavy-beaded necks are tooled to accept standard taper stoppers. Each flask is calibrated to contain at 20°C and has a large marking area for labels. Sizes range from 5 mL to 2000 mL, and a variety kit with one each of 10, 25, 50 and 100 mL flasks is also offered. LIGHT LABS ships genuine Heathrow Scientific products with knowledgeable support from our Englewood, Colorado team.
Key Features
- Class A accuracy – Made to ASTM E288 Class A and USP glassware requirements.
- Standard taper glass stopper – Seals tightly for leak-free mixing and storage.
- Sharp fill line – A uniform, well-defined graduation line makes meniscus reading easier.
- Borosilicate construction – Clear, chemically resistant glass with low thermal expansion.
- Large marking square – Space for writing sample IDs or concentrations.
- Wide size range – Capacities from 5 mL to 2000 mL plus a four-flask variety kit.
Specifications
| Catalog Number | 2306A-250 |
| Brand | Heathrow Scientific |
| Description | Volumetric Flask, Class A, Glass Stopper, 250 mL |
| Color | Clear |
| Sold As | Pack of 4 |
| Material | Borosilicate glass |
| Class | Class A, ASTM E288; meets USP |
| Calibration | To contain (TC) at 20°C (68°F) |
| Closure | Standard taper glass stopper |
| Capacity range | 5 mL to 2000 mL |
| Tolerance | ±0.02 mL (5 mL) to ±0.5 mL (2000 mL) |
Available Options
- 202GK-004 – Flasks, Variety Kit, 1 Each 10, 25, 50, 100 mL, Pack of 4
- 2306A-10 – Volumetric Flask, Class A, Glass Stopper, 10 mL, Pack of 6
- 2306A-100 – Volumetric Flask, Class A, Glass Stopper, 100 mL, Pack of 4
- 2306A-1000 – Volumetric Flask, Class A, Glass Stopper, 1000 mL, Pack of 2
- 2306A-200 – Volumetric Flask, Class A, Glass Stopper, 200 mL, Pack of 4
- 2306A-2000 – Volumetric Flask, Class A, Glass Stopper, 2000 mL, Pack of 2
- 2306A-25 – Volumetric Flask, Class A, Glass Stopper, 25 mL, Pack of 6
- 2306A-5 – Volumetric Flask, Class A, Glass Stopper, 5 mL, Pack of 6
- 2306A-50 – Volumetric Flask, Class A, Glass Stopper, 50 mL, Pack of 4
- 2306A-500 – Volumetric Flask, Class A, Glass Stopper, 500 mL, Pack of 2
Applications
- Preparing analytical standards
- Making up reagent solutions
- Dilutions for titration and spectroscopy
- QC and pharmaceutical testing
- Chemistry teaching labs
