Round-bottom flasks with two parallel necks
Made of Pyrex/Duran borosilicate glass
Round-bottom flasks with two parallel necks, made of borosilicate glass, featuring a central neck and a parallel side neck, both fitted with standard ground joints. They are designed for laboratory applications requiring the simultaneous use of multiple components and accessories.
The spherical bottom promotes uniform heat distribution, making these flasks particularly suitable for controlled heating, mixing, distillation, synthesis, chemical reactions, and solution preparation. Borosilicate glass provides high thermal and chemical resistance, good resistance to thermal shock, and excellent visibility of the contents.
The two parallel necks allow several accessories to be connected simultaneously while keeping them aligned along the same vertical axis, facilitating the organization of the experimental setup. The central neck can be used, for example, for connection to condensers, stirrers, columns, or distillation systems, while the parallel side neck allows the insertion of thermometers, probes, dropping funnels, adapters, or gas and vacuum lines.
The parallel arrangement of the two necks is particularly useful in setups where accessories must remain vertical and easily accessible, while also allowing additions, measurements, or connections to be made without interrupting the experimental system.
The standard NS ground joints ensure compatibility with a wide range of glass components and facilitate the assembly of modular apparatus, including complex experimental configurations.
Available in different capacities and with various combinations of NS joints, these two-neck parallel flasks are suitable for chemical, pharmaceutical, university, research, and quality-control laboratories.
Scientific blown glassware is manufactured through the hot working of borosilicate glass, a material particularly well suited to laboratory applications due to its thermal and chemical resistance and its ability to withstand thermal shock. Shaping is carried out by localized flame heating, controlled rotation of the workpiece, and air blowing, allowing precise geometries, uniform wall thicknesses, and smooth connections with minimal internal stress.
The main processing techniques include blowing, drawing, constriction, expansion, glass-to-glass sealing, and the manufacture of standard ground joints, fittings, hose connections, stopcocks, and special connections. Particular attention is paid to concentricity, wall-thickness uniformity, and the continuity of sealed joints, all of which are essential to ensure reliable performance during heating, vacuum operation, and fluid transfer.
After forming, the glassware undergoes controlled annealing to reduce internal stresses generated during hot working. This process improves mechanical stability and resistance to thermal shock, making the glassware suitable for both standard laboratory applications and custom-designed experimental configurations.