Membrane and Hydrogen Separation 


It is made of polypropylene fabric.


st with Membrane Materials :


  • Polyester Monofilament Mesh (works with Sodium Hydroxide, NaOH)


  • Nylon Monofilament Mesh (works with Potassium Hydroxide, KOH)


  • Silkscreen Mesh, T165


  • Uncoated Rip-Stop Nylon


  • Polypropylene


About mesh size: Mesh size is measured by how many threads of mesh there are crossing per square inch. For instance, a 165 mesh screen has 165 threads crossing per square inch.


The higher the mesh count, the finer the threads and holes are in the screen. 160 to 225 cross-counts are recommended, but any count higher than that will work; 400,500; etc. The mesh forms a thin wall that allows the water to pass through it, but not the bubbles.


The H and O ions pass through the water, cross the membrane, and form the gas on the electrode plate they are attracted to (positive or negative). The Hydrogen stays on the negative side of the membrane wall, and the oxygen stays on the positive side.


The mesh is a dividing wall; it forms/separates two chambers.


The gases rise to the top of their respective side of the chamber, and collect at the top.


They escape through the hole in the electrode plate; so, it is very important to make holes in the mesh that match up with the holes in the plates. Cut out holes for the water and for the gas. If you do not, back pressure will be created, and that could cause the gases to mix. The gases take the path of least resistance.


Mesh material can be obtained from Fabric shops, Silkscreen shops,,, Tent repair shops; etc. PerPorex sheets or Porex PTFE Membranes can also be used. You can buy them in different micron sizes and thicknesses.


I have found this material easier to work with than some of the fabrics listed above and this material is specifically manufactured to be used in diffusion scenarios like this....