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Thread: Sticky question

  1. #1
    Variable Bitrate
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    Sticky question

    I'm fabricating something to hold a touchpad. I want to be able to remove the touchpad if there's a problem. What was suggested to me...by people who don't really know this stuff...is to use silicone to glue the edges of the touchpad circuit board to the thing I'm using as the holder which will be abs plastic, this way with a little bit of force and pressure i can pry them apart if needed without breaking it. The contact surface will be 2mm all the way around. My only question is will silicone hold up the movement of my finger over the touchpad and the temps in the car -10 to 110?

    Or any particular glue recommended?

    Thanks.

  2. #2
    Constant Bitrate
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    if 10 - 110 are celcius you will have problem with hot glue. in my car it melt down and sticked to the car where now i cant remove. i would say 2 component epoxy would do the job well.

  3. #3
    Variable Bitrate
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    His location lists NY, so I am assuming that the temps he listed are in Fahrenheit... I'll leave someone else to answer the actual question though
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  4. #4
    Constant Bitrate
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    Then a hot silicon glue will be just fine. . Keep in mind that when you applying hot glue you have to heat the bonding element. I do this by leaving the pistol o nthe (abs in ur case ) just to make it hot enough.

    I have used in a lot of things in my car pc and monitors hot glue and i am very satisfied.

  5. #5
    Variable Bitrate
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    So one person says hot glue is good, the other says its bad with these temps. Who's right? Epoxy I believe is too strong. Remember, I want to be able to pop/pry the circuit board from the plastic holder if necessary. Since all of you bypassed the silicone, will assume silicone is a bad idea.

  6. #6
    Maximum Bitrate
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    Hot glue is a bad idea inside a car. As already mentioned if your car reaches high enough temps the hot glue will come "unglued" because it will melt...

    Epoxy if you want to make sure it won't go anywhere..

    Silicone really is a great suggestion. I am looking at an application now where you use high temp Silicone to seal a compartment on the engine that gets near 300F. Just make sure you use a non conductive silicone and one that is rated for high enough temperatures for your car. (Standard non conductive silicone should be good. ) You can check if it is non conductive by using a VOM and checking for conductivity. I made the mistake of sealing some temperature sensors with conductive silicone once not knowing there was a difference... Needless to say the probe didn't work.

    You can generally also use 3M tape but you have to get one that will work in your car. The tape MAY degrade over time but there are body parts of some cars that are taped on originally from the factory... Make sure you get the adhesive strength and temperature range you want. Or just any 3M branded double sided tape will likely work.

  7. #7
    Maximum Bitrate jmullan99's Avatar
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    I use hot glue to mount my monitor in my dash. Hasn't failed me yet summer heat (+40c) through winter cold (-20c).
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  8. #8
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    I'm going to try double sided 3m tape, 20lbs first. If that doesn't hold up I think I'll look at non conductive silicone, just a matter of where to get it. Thanks.

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