what type of silicon?- Mtbr.com
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  1. #1
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    what type of silicon?

    reading the MCE manual ( p9 ) I see they are sensitive to various adhesives / chemicals. What type of silicon are people using, acid cure or neutral cure?

    http://www.cree.com/products/pdf/XLa...ndHandling.pdf

  2. #2
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    Quote Originally Posted by rickh1
    reading the MCE manual ( p9 ) I see they are sensitive to various adhesives / chemicals. What type of silicon are people using, acid cure or neutral cure?

    http://www.cree.com/products/pdf/XLa...ndHandling.pdf
    Silicon? No, use a thermal edhesive such as this, it conducts the heat from the led to the housing and out to the air.
    http://www.arcticsilver.com/arctic_a...l_adhesive.htm

  3. #3
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    oh, I meant for use in other areas of the housing, front panel, securing optics etc. I see troutie uses silicon on many of his projects.

  4. #4
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    Keep the silicone away from the critical surfaces on the optics as they rely on the refraction at the optic air interface.

  5. #5
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    Ewwww keep away from the acid type!!
    delicate board traces and components dont like it
    neutral cure is the way to go
    ...Scun.thorpe, UK

  6. #6
    100% italian mtbiker
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    go for the "neutral" silicon (the one that doesn't stink like cheap vinegar) as it doesnt have solvents in it.

  7. #7
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    thanks for the advice guys.

    the only issue with the neutral cure silicon i have found is the cure time, 72hrs! just hate waiting to play with new toys...

  8. #8
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    Get everthing in place then heat with a hair dryer or switch the light on and let it get nice and hot and the stuff will cure very fast.

  9. #9
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    thanks yeti, i need to do some temperature mapping for the housing so that will speed the cure time up.

  10. #10
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    Alot of the neutral cure silicons need humidity as well as warmth for a quicker cure as they use the moisture in the air to kick off the cure.

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