I attached the related link below.
http://www.consultrsr.net/resources/general/vycor.htm
In one of my old labs we used a compressed paper as the membrane/ frit at the edge of the electrode. If you did it right the electrode was good for almost a year
Dear Jung:
We utilize a polimeric battery separator at last 15 years . In the past we sinterized frits with caolin . A paste of caolin was filled inside a small glass tube and this tube was fired to sintherize the caolin. The control to know if the material was adequatelly syntherized was adapt this tube in a syringe and press air trough the syntherized. If a lot of air comes out, it is necessary to submit a new syntherization. If any air comes out, than the extremity must be sanded till found some way to pass a very small amount of electrolyte.
The main characteristic of a frit is maintain the electrical contact, with minimum leakage of electrolyte. In a reference electrode, the amount of current that pass through this membrane is really small, and so the resistance is not a determinant factor. In this way, a minimum porosity to establish the electrical contact is sufficient. The smaller the pores of the frit, the miminum contamination of the analysed solution and also the internal solution.
We dcided to use Molecular sieves, 4 Å of pellets, 3.2 mm diameter (334294 SIGMA-ALDRICH) and this works good. Thank you for your answers.
http://www.sigmaaldrich.com/catalog/product/sial/334294?lang=ko®ion=KR
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