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Glue for LED PCBs to aluminium heatsink......Glass transition temperature?

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grizedale

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Hello,

Our contract design company has supplied us with a prototype LED lamp with the LED PCBs glued to the aluminium heatsink with Loctite 382.

Loctite 382 Datasheet:-
http://tds.loctite.com/tds5/docs/382-EN.PDF

The PCBs LEDs are dissipating 1.8W.

Its a non-ventilated plastic enclosure , so the LEDs may get very hot.

I am wondering , since the "Glass transition temperature " of loctite 382 is 120degC, does that mean that at 120degC on the dot, the glue will become so useless that the LED PCB's will slide off the aluminium heatsink? (They are mounted vertically, so they could fall away if the glue weakens)
 

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