How many bottles of Electrode Cap Gel do I need?

Hi all,

I am conducting a research using All-in-One EEG Electrode Cap Starter Kit. The number of subjects is around 40, of which each is mounted with 16 electrodes. I read the gel's description (, but I could not find an information that I can imply the number of gel bottles needed for my experiments. I will be very glad if somebody could suggest me.



  • wjcroftwjcroft Mount Shasta, CA

    Attha, hi.

    The container size is 16 fluid ounces, same as 2 cups or 1 pint or .47 liters. That is a lot of gel.

    Here is a manual from Electro-cap, not the same as the cap sold by OpenBCI, but similar idea. The gel however is identical.

    On page 20 they state:

    The usual patient requires only 3 to 5 cc of gel to fill all (19) 10-20 sites. Do NOT use an excessive amount of gel. Using too much gel is not only wasteful, it can cause electrode shunts.

    You are only doing 16 channels, not 19. The number of cc's (milliliters) in .47 liter, is 470 cc. 470 / 4 = approximately 117 subjects. The electrode cup size is fairly large on Electro-cap vs the OpenBCI cap. So you'd likely get even more subjects than this.

    Regards, William

  • wjcroftwjcroft Mount Shasta, CA

    Perhaps to be conservative, 2 bottles might be wise. They do mention on that same page that people with thick / bushy hair, may require up to 10 cc per subject.

    It's probably also likely that you could find this same electrode gel for sale there at a lab supply shop in Thailand. So you may be able to delay your additional purchases until needed.

  • atthaattha Bangkok

    Hi William,
    Thanks for the quick reply :)

    best, Atthaphon

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