Choosing the right 250ml Erlenmeyer flask can impact accuracy, durability, and ease of handling in the lab. This guide highlights five reliable options featuring 3.3 borosilicate glass, narrow mouths, and useful graduations. Each product offers solid performance for routine mixing, titration, and sample storage in educational and professional settings.
| Product | Brand | Capacity | Notable Feature |
|---|---|---|---|
| 250ml Narrow Mouth Erlenmeyer Flask | Karter Scientific | 250 ml | 3.3 borosilicate glass; standard graduations |
| Utile Glass Erlenmeyer Flask Set | Utile | 6 x 250 ml | Printed graduations; durable borosilicate glass |
| 250ml Narrow Mouth Erlenmeyer with Rubber Stopper | Karter Scientific | 250 ml | Includes solid rubber stopper; 25 ml to 250 ml graduations |
| Corning Pyrex Narrow Mouth Erlenmeyer Flask | Corning | 250 ml | Rubber stopper included; reliable Pyrex glass |
| 250ml Erlenmeyer Flask with Blue Screw Cap | Karter Scientific | 250 ml | Screw-cap closure; 50 ml to 200 ml graduations |
Karter Scientific 250ml Narrow Mouth Flask
This 250 ml Erlenmeyer from Karter Scientific uses 3.3 borosilicate glass, offering strong chemical resistance and clear visibility. The narrow mouth design helps minimize spillage during swirling and mixing, while the graduated markings from 100 ml to 250 ml support quick volume checks. Height is approximately 148 mm, providing a compact profile suitable for standard lab racks and incubators.
Utile 250ml Erlenmeyer Flask Set
The Utile set includes six narrow-mouth flasks, each with 250 ml capacity. Made from 3.3 borosilicate glass, these flasks feature uniform wall thickness and high durability. Printed graduations provide reliable measurements, with extra-large marking spots for quick reading even at a glance. This set is ideal for classrooms and shared lab spaces where multiple flasks are in use simultaneously.
Karter Scientific 250ml Narrow Mouth With Rubber Stopper
This flask combines a 3.3 borosilicate body with a solid rubber stopper, enhancing seal integrity for storage and reaction setups. It supports graduations from 25 ml up to 250 ml, which aids in precise dilution and titration tasks. The robust construction is suitable for routine lab protocols and educational demonstrations where repeatable results are important.
Corning Pyrex 250ml Narrow Mouth Erlenmeyer Flask
Corning Pyrex flasks are known for reliability and chemical compatibility. This 250 ml model includes a rubber stopper (#06) and a narrow mouth that reduces splashes during mixing. Graduation increments run up to 200 ml with consistent 25 ml spacing, making it suitable for quick titrations and sample preparations in standard lab workflows.
Pyrex 250mL Narrow Mouth Erlenmeyer with Heavy Duty Rim
This Pyrex Erlenmeyer provides a reliable 250 ml capacity with an outer diameter around 82 mm and a durable heavy-duty rim. Graduation intervals are set at 25 ml, allowing straightforward measurement during routine procedures. The heavy rim contributes to a sturdy grip and durability in busy lab environments.
Karter Scientific 250ml Erlenmeyer with Blue Screw Cap
This 250 ml Erlenmeyer includes a blue screw cap for secure storage and reduced evaporation. The glass body is borosilicate, designed for stability in basic and acidic solutions. Graduations range from 50 ml to 200 ml, providing a clear measurement range for common sample preparation tasks and titration experiments.
Buying Guide: Key Considerations For 250ml Erlenmeyer Flasks
- Glass Type: Most entries use 3.3 borosilicate glass, which offers good chemical resistance and thermal stability for routine lab tasks. Avoid soft glass for high-temperature or highly reactive workflows.
- Mouth Design: Narrow mouths reduce splashes and improve control during swirling, while maintaining ease of pouring. Consider whether you need a stopper or screw-cap for storage.
- Graduations: Look for legible, clearly printed graduations. Additional large markings or color-coded scales can speed readings in busy environments.
- Closure Options: Rubber stoppers provide a simple seal for reactions, whereas screw caps offer a stronger seal for storage. Ensure compatibility with the liquids you plan to handle.
- Durability: Uniform wall thickness and a robust rim contribute to longevity under routine handling and cleaning cycles.
- Set Availability: For training or classrooms, a set with multiple flasks offers value and consistency across experiments.
- Size Consistency: Even within 250 ml capacity, rim diameter and overall height vary slightly. Check compatibility with your storage racks, clamps, and hotplates.
- Intended Use: For titration or reaction monitoring, precise graduations and tight seals matter. For storage, consider cap type and chemical compatibility.
When selecting a 250 ml Erlenmeyer flask, balance precision with practicality. Flame resistance, cleaning compatibility, and the ability to withstand repeated heat cycles should align with your typical lab protocol. If you work in a shared space or classroom, a durable set with consistent quality can simplify inventory management and learning outcomes.