Needle stopcocks with PTFE plug
In borosilicate glass
Needle stopcocks made of borosilicate glass with PTFE plugs, designed for fine and controlled regulation of gas or liquid flow in laboratory apparatus.
The needle geometry allows progressive and precise flow adjustment, making these stopcocks particularly suitable for applications requiring a high level of flow control.
The PTFE plug ensures smooth operation, reliable sealing, and high chemical resistance, while the borosilicate glass body provides thermal resistance and compatibility with a wide range of reagents.
The standard NS joint also facilitates integration with compatible laboratory systems and components.
To order
| Code | Description |
| GS/010/601 | Needle stopcock NS 12.5 Ø bore 1.5/2 mm PTFE plug |
Scientific blown glassware is manufactured through hot working of borosilicate glass, a material particularly suitable for 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 thickness, and smooth transitions 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 welded joints, all of which are essential for 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 experimental configurations.