For reliable sample preparation, precise measurements, and chemical durability, ground glass stoppered flasks are a staple in many laboratories. This guide highlights five highly relevant options featuring ground glass stoppers or compatible ground glass components, explained with key specs to help researchers and students select the right fit. Each product emphasizes chemical resistance, temperature tolerance, and secure sealing essential for volatile substances and sensitive experiments.
| Product | Brand | Capacity | Stopper Type | Notes | Link |
|---|---|---|---|---|---|
| HUAOU 150ml Erlenmeyer Flasks Set | HUAOU | 150 ml | Ground glass stopper | Pack of 3; borosilicate 3.3; microwavable and autoclavable | Amazon |
| Karter Scientific 213W10 | Karter Scientific | 250 ml | Glass stopper | Class A; borosilicate glass | Amazon |
| QWORK 1000ml Volumetric Flask | QWORK | 1000 ml | Glass stopper | 3.3 borosilicate; ground stopper not explicitly stated | Amazon |
| DONLAB FLK-12-500 | DONLAB | 500 ml | Ground glass stopper | Iodine flask; 24/26 penny head stopper | Amazon |
| TPMCOS Retort Distilling Flask | TPMCOS | 1000 ml | Ground in glass stopper | Distillation flask; borosilicate 3.3 | Amazon |
Note: The selections above emphasize ground glass compatibility and stability under typical lab conditions. When selecting a flask, consider the stopper type, capacity, and glass quality to match your specific protocols and safety requirements.
HUAOU 150ml Erlenmeyer Flasks Set
The HUAOU 150ml set includes three conical flasks, each paired with a matching ground glass stopper. Made from 3.3 borosilicate glass, these flasks are designed for high chemical durability and low thermal expansion, making them suitable for reactions that require precise temperature control. The flasks are compatible with microwaves and autoclave cycles, enabling rapid sterilization and reuse in demanding lab environments. The compact 150 ml capacity strikes a balance between manageable volumes and practical handling, ideal for small-scale synthesis and volatile-substance experiments.
Key features include a precise diameter and height (70 mm x 115 mm), stable handling, and a sealed system that minimizes vapor loss. The pack of three provides a practical starter set for teaching labs or supplemental supplies in research settings.
Karter Scientific 250ml Ground-Glass Flask
This 250 ml class A borosilicate glass flask from Karter Scientific emphasizes reliable measurement and chemical resistance with a glass stopper. The //Class A// specification indicates tight tolerances, ensuring consistent volumes for accurate solutions or reaction monitoring. While the product description highlights a stoppered design, it is paired with a glass stopper rather than a rubber or cork seal, providing improved chemical compatibility and a sturdy seal for many laboratory tasks.
Ideal for small-volume reactions, standard dilution workups, and sample storage, this flask’s borosilicate construction supports resistance to thermal stress and a broad range of reagents. The reach and grip of the flask are suitable for daily lab routines that require dependable, reusable glassware.
QWORK 1000ml Volumetric Flask With Glass Stopper
This 1000 ml volumetric flask by QWORK features a glass stopper and borosilicate glass construction. Volumetric flasks are designed for precise concentration preparation, and this model emphasizes durability with a thick borosilicate material. The design supports accurate measurement of solutions used in reagent preparation, calibration, and analytical workflows. The listed features highlight a flat bottom for stable tabletop use and a clear body to easily monitor liquid level during filling and mixing.
Users can rely on the robust glass stopper to minimize evaporation and maintain solution integrity during long preparation steps. While the description notes a glass stopper rather than a ground joint, the combination of precision volume and reliable sealing makes it a suitable option for labs prioritizing accuracy and repeatable results.
DONLAB FLK-12-500 Iodine Flask
The DONLAB FLK-12-500 is a 500 ml iodine determination flask featuring a ground glass stopper (24/26 penny head stopper). This design supports specific analytical workflows that require a secure seal and compatibility with iodine chemistry. The borosilicate glass composition provides chemical resistance and thermal tolerance suitable for routine iodine analysis and related procedures. The ground glass stopper helps minimize vapor loss and contamination during handling and storage.
For laboratories conducting iodine speciation, photometric assays, or iodine-based test procedures, this flask offers a practical balance between capacity and reliability, with compatibility for routine laboratory workflows and cleaning protocols.
TPMCOS Ground-Stopped Distilling Flask
This TPMCOS distilling flask highlights a ground glass stopper integration designed for distillation and condensation workflows. The borosilicate 3.3 glass provides the chemical resistance needed for handling acids, alkalis, and common lab solvents. The distillation-flask design is noted for combining distillation and condensation functions, offering a compact solution for simple lab setups where a dedicated condenser might be minimized.
With a 1000 ml capacity, this flask supports larger sample volumes and multi-step distillation processes, while maintaining a robust sealing interface through its ground glass stopper. The curved neck and handle configuration align with traditional glass apparatus used in teaching labs and small-scale research projects.
Buying Guide: Key Considerations For Ground Glass Stoppered Flasks
- Glass quality: Prioritize borosilicate 3.3 for chemical resistance and low thermal expansion. Look for flasks labeled Class A for tighter tolerances.
- Stopper design: Ground glass stoppers provide superior sealing and temperature compatibility, especially with volatile substances. Check compatibility with the intended reagents and avoid materials that react with chosen solvents.
- Volume and geometry: Choose a capacity that aligns with your workflow. Erlenmeyer shapes offer convenient swirling and mixing, while volumetric and distilling flasks support precise measurements and separation steps.
- Sealing integrity: Frosted glass stoppers often indicate a good seal, but verify stopper-to-neck compatibility. Some sets pair stoppers with specific flasks; one-to-one correspondence helps prevent mismatches.
- Cleaning and sterilization: Microwave and autoclavable options provide flexible cleaning. Consider whether your lab requires repeated sterilization or chemical resistance during cleaning cycles.
- Application fit: If you perform iodine analysis or distillation, prioritize flasks with appropriate stoppers and neck designs. Distilling flasks with integrated condensation features can streamline setups.
- Handling and durability: Thick-walled, heavy-duty borosilicate glass reduces breakage during routine handling. Flat-bottom designs improve stability on benchtops during long procedures.
- Cost vs. value: Ground glass systems offer reliability, but ensure stopper compatibility and ease of replacement when selecting multi-flask sets or single high-capacity pieces.
When selecting a ground glass stoppered flask, balance capacity, sealing quality, and the specific chemical or physical processes in your lab. For teaching laboratories, sets with multiple sizes provide versatile teaching aids; for research labs, high-precision volumetric flasks and distilling flasks deliver repeatable results across experiments.