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VWR® Round Bottom Flask, with Two Necks and Standard Ground Joints
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Specifications:
| Application | Analytical Chemistry |
| Material | Borosilicate glass |
| Storage Temperature | Ambient |
| Product Type | Laboratory Glassware, flasks |
| Product Brand | VWR |
| Product Grade | Analytical grade |
DIN 12394 | Borosilicate 3.3 Glass | Clear | Chemical and Thermal Resistant
The VWR® Two-Neck Round Bottom Flasks are premium-quality laboratory vessels designed for multi-access synthesis, distillation, and heating applications. Constructed from high-grade borosilicate 3.3 glass, these flasks feature a central vertical neck and an angled side neck, both with precision standard ground joints (NS), ensuring compatibility with a wide range of laboratory adapters and fittings.
These flasks conform to DIN 12394 standards, offering excellent dimensional stability, high resistance to thermal shock, and superior chemical durability. The angled side neck provides convenient access for inserting thermometers, condensers, dropping funnels, or gas inlet tubes, enabling versatile experimental configurations.
Key Features
- Dual-Neck Design: One central vertical neck and one angled side neck for simultaneous reagent addition, sampling, or sensor integration.
- Standard Ground Joints: Available in NS 14/23 and NS 29/32 configurations for leak-free, standardized connections.
- Borosilicate 3.3 Glass Construction: Offers outstanding resistance to chemicals, thermal shock, and mechanical stress, making it ideal for heating and reflux applications.
- Permanent Markings: Each flask includes a white labelling area and an imprinted catalog number for traceability and convenient reordering.
- Wide Capacity Range: Available in sizes from 25 mL to 1000 mL to accommodate small-scale to medium-volume reactions.
- DIN-Compliant Quality: Manufactured according to DIN 12394, ensuring dimensional accuracy and interchangeability.
Technical Specifications
| Catalog No. | Capacity | Center Neck | Side Neck | Material | Certification | Pack Size |
|---|---|---|---|---|---|---|
| 201-0540 | 25 mL | 14/23 NS | 14/23 NS | Borosilicate 3.3 Glass | DIN 12394 | 1 |
| 201-0541 | 50 mL | 14/23 NS | 14/23 NS | Borosilicate 3.3 Glass | DIN 12394 | 1 |
| 201-0542 | 100 mL | 29/32 NS | 14/23 NS | Borosilicate 3.3 Glass | DIN 12394 | 1 |
| 201-0543 | 250 mL | 29/32 NS | 14/23 NS | Borosilicate 3.3 Glass | DIN 12394 | 1 |
| 201-0544 | 500 mL | 29/32 NS | 14/23 NS | Borosilicate 3.3 Glass | DIN 12394 | 1 |
| 201-0545 | 1000 mL | 29/32 NS | 14/23 NS | Borosilicate 3.3 Glass | DIN 12394 | 1 |
Applications
- Organic synthesis requiring multi-port access
- Reflux and distillation processes
- Controlled reagent addition or sampling during reactions
- Monitoring temperature via thermometer inlet
- Gas-liquid reactions with sparging or vacuum connections
The VWR® Two-Neck Round Bottom Flasks are a versatile and economical solution for laboratories performing complex chemical reactions. Their robust borosilicate construction, standardized joint compatibility, and multi-neck design make them ideal for both research and routine use. Whether used in academic labs, R&D facilities, or industrial process settings, these flasks deliver reliable performance and safety under demanding laboratory conditions.
- Capacity: 25 mL, Center neck size: 14/23 NS, 14/23 NS 50 mL, Center neck size: 14/23 NS, Side neck size: 14/23 NS 100 mL, Center neck size: 29/32 NS, side neck size: 14/23 NS 250 mL, Center neck size: 29/32 NS, side neck size: 14/23 NS 500 mL, center neck size: 29/32 NS, Side neck size: 14/23 NS 1000 mL, center neck size: 29/32 NS, Side neck size: 14/23 NS