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why the silicone sealer on pcb boards ?

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    why the silicone sealer on pcb boards ?

    wondering why the battery packs i have been looking at have a coating of white silicone type stuff covering them ? its just i had to remove it from a board to repair it and wondered if and what i should replace it with ?
    these are the 80v power tool packs .
    only thing i can think of is to help stop bits falling off with the vibrations from the tools .
    p.s it comes off ok with petrol and an old toothbrush . and patience .

    #2
    Re: why the silicone sealer on pcb boards ?

    probably to keep moisture out of the circuits.

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      #3
      Re: why the silicone sealer on pcb boards ?

      they appear to have been clear lacquered first then the white stuff .

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        #4
        Re: why the silicone sealer on pcb boards ?

        liquid electrical tape is what you want, good stuff but fairly expensive .
        All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

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          #5
          Re: why the silicone sealer on pcb boards ?

          do i actually need to use the white stuff or can i just use the pcb lacquer ? as that would surely keep out damp as that's what it is for .
          it crossed my mind whether it is used to hold back fire in case the boards decide to go up in flames .

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            #6
            Re: why the silicone sealer on pcb boards ?

            yes you could just use lacqer.if you want to fill it with silicone get some specially for pcb`s ,neutral cure RTV.
            All donations to badcaps are welcome, click on this link to donate. Thanks to all supporters

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              #7
              Re: why the silicone sealer on pcb boards ?

              thinking of getting this one as will need more in the future . https://www.ebay.co.uk/itm/293436685...IAAOSwbTVeJ2zH

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                #8
                Re: why the silicone sealer on pcb boards ?

                that's some nasty shit - you have to use it outdoors!

                i use a chinese version of this:
                https://www.aliexpress.com/item/32949184183.html

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                  #9
                  Re: why the silicone sealer on pcb boards ?

                  outside is fine for me .. well so long as its not raining that is .

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