Description
BOLA pressure equalisation membranes for GL 45 are PTFE filter membranes with a thickness of 0,2 mm and a pore size of 2,5 µm. Intended for GL 45 threads, the round discs measure 42 mm in diameter per manufacturer dimensions and provide pressure equalisation together with fine particulate retention. Produced from polytetrafluoroethylene (PTFE), they deliver chemical resistance suited to laboratory bottle and reactor closures that require controlled venting. Flow performance is specified at 210 l/h at 0,5 bar and 800 l/h at 1 bar, supporting higher gas throughput on wide-neck systems. Available as a pack of 5 pieces from manufacturer Bohlender, the membranes match standard GL 45 screw-thread laboratory glassware. Net weight is indicated as 0,00315 kg for the lightweight PTFE format. These discs help balance internal and external pressure during storage, reaction, or transfer operations while maintaining a defined filtration barrier, making them a practical component for setups that combine containment with reliable pressure compensation on larger GL necks.
This article is part of Membrane filters, in Filtration.
Key features
- Pack size: 5 pc(s)
- Material: Polytetrafluoroethylene (PTFE)
- Thread size: GL 45
- Disc diameter: 42 mm
- Thickness: 0,2 mm
- Pore size: 2,5 µm
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Questions about BOLA Membranes for compensation, GL 45, Ø 40 x 0,2 mm, 2,5µm PTFE Pack size: 5 p
What is this article?
BOLA Membranes for compensation, GL 45, Ø 40 x 0,2 mm, 2,5µm PTFE Pack size: 5 p is the article on this page. Luminix Health distributes Bohlender for laboratory use. It sits in Membrane filters, inside Filtration, in Lab consumables.
A membrane filter is the disc itself, without a syringe housing. Pore size, polymer and diameter are the specification, and the disc has to sit in a holder. Gridded membranes are for counting colonies. A membrane and a filter paper of the same diameter are not interchangeable.
Filtration holds back what is larger than the pores and lets the rest through. Paper is the ordinary laboratory filter. A membrane has a stated pore size and a polymer that must survive the solvent. A syringe filter is that membrane in a housing on a syringe. Glass fibre takes a higher dirt load. Ultrafiltration holds back macromolecules and passes salts. The pore size, the chemical compatibility and the volume are the three choices. Laboratory apparatus around filtration is indexed under ISO laboratory apparatus.
Which category should I open next?
The category is Filtration. The sub-category is Membrane filters. The catalogue is Lab consumables.
Shelves beside this one are Filter paper, Sintered glass filter plates & discs, Syringe filters, Filter cartridges & capsules, Glass & quartz fibre filters, Bottle-top & vacuum filtration units, Ultrafiltration & concentrators, Filtration accessories, Extraction thimbles and Dialysis tubing & devices.
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The seven catalogues are Labware, Lab chemicals, Lab instruments, Lab consumables, Chromatography equipment, Lab safety equipment and Life Science & Microbiology.