The Glue or Mastic question

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  • mikebw22
    New Member
    • Feb 2013
    • 9
    • USA

    #1

    The Glue or Mastic question

    I know it's recommended to remove the old glue or mastic, but are there times when you need to glue components and what would you use? For example on the Samsung 245bw invertor board the 4 caps have like a white bathroom caulk securing the cap end to the board. I don't know if that's really necessary. You also see resistors glued to each other and caps glued to resistors, etc.

    Thanks
    Mike
  • smason
    Badcaps Legend
    • Feb 2010
    • 1652
    • Canada

    #2
    Re: The Glue or Mastic question

    I only remove glue if I need to remove a component that has glue on it, or if the glue has turned brown. Some glues that turn a brownish colour start to conduct and cause weird problems.
    36 Monitors, 3 TVs, 4 Laptops, 1 motherboard, 1 Printer, 1 iMac, 2 hard drive docks and one IP Phone repaired so far....

    Comment

    • budm
      Badcaps Legend
      • Feb 2010
      • 40746
      • USA

      #3
      Re: The Glue or Mastic question

      The yellow glue which will turn brown and become conductive and also corosive whick will eat away the conductors. The glue are used to keep the component in place during wave soldering process. I do not use any glue except if the parts are laid side way such as big filter cap, I use electronic grade Silicone RTV, regular Silicone RTV has mild acid (the vinegar oder) which will damage conductor such as copper trace.
      Last edited by budm; 03-05-2013, 09:56 AM.
      Never stop learning
      Basic LCD TV and Monitor troubleshooting guides.
      http://www.badcaps.net/forum/showthr...956#post305956

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      http://www.badcaps.net/forum/showthr...999#post300999

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      http://www.badcaps.net/forum/showthr...er+testing+cfl

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      Comment

      • Gabriel
        Badcaps Veteran
        • Jan 2010
        • 620
        • Norway

        #4
        Re: The Glue or Mastic question

        Just got these, tack free after 60 minutes and a cure time of 10 hours, made by crc.

        Operating temperature active product -50 to +230
        Dielectric strenght active product 17 kV

        Crc 32045-001
        Attached Files
        Last edited by Gabriel; 03-05-2013, 10:22 AM. Reason: Added spec

        Comment

        • larrymoencurly
          Badcaps Veteran
          • Oct 2004
          • 960
          • USA

          #5
          Re: The Glue or Mastic question

          Originally posted by budm
          I do not use any glue except if the parts are laid side way such as big filter cap, I use electronic grade Silicone RTV, regular Silicone RTV has mild acid (the vinegar oder) which will damage conductor such as copper trace.
          The silicone RTV rated safe for car exhaust oxygen sensors should also be OK. Before it cures it smells a bit like alcohol instead of like vinegar. A lot of GE brand RTV is like that, but it's not labelled "sensor safe".

          Comment

          • mikebw22
            New Member
            • Feb 2013
            • 9
            • USA

            #6
            Re: The Glue or Mastic question

            Originally posted by larrymoencurly
            The silicone RTV rated safe for car exhaust oxygen sensors should also be OK. Before it cures it smells a bit like alcohol instead of like vinegar. A lot of GE brand RTV is like that, but it's not labelled "sensor safe".
            I just might have some of that being a mechanic/technician.

            Comment

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