Description
BOLA bellows NS 19/26 – NS 19/26 PTFE with pointed folds are flexible ground-joint connectors for mid-size laboratory glassware that must tolerate angular offset. Fabricated from polytetrafluoroethylene (PTFE), they incorporate pointed folds and sealing rings on the outside of the ground-joint cone, supporting deflection of up to 120°. Socket and cone both conform to NS 19/26 (European standard), creating a continuous NS 19/26 interface suitable for distillation columns, reactors, and vacuum lines built on this joint size. Total length varies between a minimum of 93 mm and a maximum of 105 mm, combining modest axial extension with the lateral freedom of the fold geometry. Net weight is 0,051 kg. Offered as a single piece from manufacturer Bohlender, these PTFE bellows serve routine laboratory applications where chemical resistance, cleanability, and reliable sealing at NS 19/26 joints are required without introducing metal or soft elastomer components into the process stream.
This article is part of Distillation heads, adapters & columns, in Distillation & extraction glassware.
Key features
- Pack size: 1 pc
- Material: Polytetrafluoroethylene (PTFE)
- Joint size: NS 19/26 socket and NS 19/26 cone
- Design: Pointed folds with external sealing rings on cone
- Deflection: up to 120°
- Total length: 93–105 mm
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Questions about BOLA Bellows, NS 19/26 - NS 19/26 PTFE, with sharp folds
What is this article?
BOLA Bellows, NS 19/26 - NS 19/26 PTFE, with sharp folds is the article on this page. Luminix Health distributes Bohlender for laboratory use. It sits in Distillation heads, adapters & columns, inside Distillation & extraction glassware, in Labware.
A still head, an adapter or a column is the glass between the boiling flask and the condenser. A Vigreux or packed column gives the vapour a surface so a closer-boiling mixture can separate. The joint sizes at both ends have to match the flask and the condenser.
Distillation separates liquids by boiling point. A condenser turns the vapour back into liquid: Liebig, coil and cold-finger shapes differ in how much cooling surface they offer. A still head and a column sit between the flask and the condenser. A Soxhlet extractor washes a solid again and again with the same solvent. Ground joints have a standard size, and the joint, not the flask, is what has to match. The pieces are indexed under ISO laboratory glassware.
Which category should I open next?
The category is Distillation & extraction glassware. The sub-category is Distillation heads, adapters & columns. The catalogue is Labware.
Shelves beside this one are Condensers, Ground-joint glassware (other) and Soxhlet & extraction apparatus.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.