Description
| Capacity (ml) | Centre Size | Side Socket | Overall Height (mm) | Pack of | SKU – | Enquiry |
|---|---|---|---|---|---|---|
| 50 | 14/23 | 14/23 | 100 | 1 | PSF2N-0050-1423 | Enquire Now |
| 100 | 14/23 | 14/23 | 130 | 1 | PSF2N-0100-1423 | Enquire Now |
Frequently Asked Questions
A pear-shaped flask with two necks is a versatile, round-bottomed reaction vessel designed for heating, distillation and multi-step organic or inorganic syntheses in research and industrial laboratories. The flask features a single centre vertical neck (for thermometers, condensers or vapour outlets) and one angled side neck (for addition funnels, gas inlets or sampling tubes). Osmosis Scientific pear-shaped two-neck flasks are made from heat-resistant borosilicate 3.3 glass and comply with DIN 12383 dimensions, making them ideal for reflux setups, distillations, controlled additions and simultaneous heating and cooling applications where two independent access points are essential.
Osmosis Scientific pear-shaped two-neck flasks are manufactured from borosilicate 3.3 glass, a premium heat-resistant and chemically durable material. This composition ensures: – Excellent thermal shock resistance—can handle rapid heating and cooling without cracking – Superior chemical resistance to most acids, bases, alcohols, and organic solvents – Low thermal expansion coefficient—maintains dimensional stability during high-temperature reactions – Long service life with minimal etching or clouding from repeated use The borosilicate 3.3 standard is internationally recognized and complies with ISO 3585 and ASTM E-438 requirements for laboratory glassware.
Osmosis Scientific offers pear-shaped two-neck flasks in a range of standard capacities and ground-glass joint (NS) sizes to match your reaction scale and apparatus connections:
- – 50 mL with 14/23 centre and side sockets — for small-scale synthesis, micro-distillations and teaching labs –
- 100 mL with 14/23 centre and side sockets — the most common size for typical organic reactions and lab-scale preparations –
- 250 mL, 500 mL and 1000 mL with larger NS joints (19/26, 24/29) — for scaled-up industrial and pilot-plant syntheses,
All joints are ground-glass standard-taper (DIN 12383), ensuring compatibility with standard condensers, thermometers, addition funnels and reflux apparatus. Contact Osmosis Scientific for custom capacities or joint configurations.
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