Cleaning off LM(liquid metal

Discussion in 'Sager and Clevo' started by Timbabs123, Dec 14, 2017.

  1. Timbabs123

    Timbabs123 Notebook Consultant

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    Hello everyone. Am having problems cleaning off LM from my notebooks heatsink. I will attach an image showing the LM in the heatsink. It seems like it's dried off as I took the notebook apart but I didn't clean it off immediately and just let it stay. I tried to clean it off this afternoon but it doesn't seem to be working.

    I use the Arctic clean 1 and 2 and non of that is making it come off.

    Am going to try heating it up again to see if I can get it to go liquid. Any other suggestions welcome, thanks. [​IMG]

    Sent from my SM-G935F using Tapatalk
     
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  2. TheReciever

    TheReciever D! For Dragon!

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    My limited knowledge of this, is that LM bonds to copper to a certain degree.

    When I removed mine for re-application I used a wire spin brush but I couldnt tell you if thats appropriate.
     
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  3. Timbabs123

    Timbabs123 Notebook Consultant

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    Yh I might have to try that, but yh, like you said, am not sure thats the best way
     
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  4. TheReciever

    TheReciever D! For Dragon!

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    It works for the quick and dirty but I would consider lapping at that point to make sure your contact is flat.
     
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  5. t6nn_k

    t6nn_k Notebook Consultant

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    If the surface is nice and flat then it is just cosmetical. I had mine dry up solid and only way I could make it flat was lapping the heat sink. Back to regular paste.
     
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  6. Prostar Computer

    Prostar Computer Company Representative

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    This.

    A wire brush will mar the surface of the copper. Since compound is designed to fill microscopic imperfections, it's not the worst thing you can do, but the fact remains that this stuff is very difficult to completely clean off, and in a lot of cases, it will leave a kind of stain.
     
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  7. Jumpwired

    Jumpwired Notebook Consultant

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    LM pro-tip: Use a cutting agent to remove LM from the heatsink or IHS. Meaning any metal polish or car cutting compound will polish off the top layer of exposed blemished copper.

    Heard Brasso works...

    Might not leave it spotless, but this is the best method of cleaning it off.

    Best thing is to always approximate the size of the contact and use masking tape while applying LM to the HS and remove it after. Also saves you a bit of LM.
     
    Last edited: Dec 14, 2017
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  8. Timbabs123

    Timbabs123 Notebook Consultant

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    Wont masking tape dampen heat transfer?

    and I cant get brass now so am guessing am gonna have to brush it with a spin brush then
     
  9. bennyg

    bennyg Notebook Deity

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    Some of the gallium from the LM gets in and alloys with the copper. It doesn't affect heatsink performance.

    Scratching up the surface with a wire brush or polishing off metal making the heatsink concave (increasing the gap that TIM has to fill) will though.

    Just get some fine sandpaper to remove any crusty surface deposit, lap it back to flat, and let it be. It's a cosmetic stain.
     
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  10. Jumpwired

    Jumpwired Notebook Consultant

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    Sorry you misunderstood. I mean when painting the LM, try to eye the size of the contact area on your heatsink and tape around the edges of that area. Paint the LM on onto the heatsink, use the tape as a guide and paint to the edge. Then rip the tape off when putting it all together. It will leave a nice square shape, helps avoid pump out, saves LM and makes it a bit cleaner.

    Not brass, brasso is a cheap and popular metal polish.
     
  11. Meaker@Sager

    Meaker@Sager Company Representative

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    I know it really gets to some people but the marks are not going to be seen so it's just something you have to live with when using LM.
     
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