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http://indianaquariumhobbyist.com/community/ :: View topic - any one tried joining LED on heat sink using Silicon RTV
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any one tried joining LED on heat sink using Silicon RTV

 
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syed
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PostPosted: Fri May 06, 2016 11:35 pm Post subject: any one tried joining LED on heat sink using Silicon RTV Reply with quote

 recently  i  went  to  buy  led  and  my  old  guy  told  me  that  these  days  they  are  joining  LED  on  the  heat  sink  using  Silicon  RTV  of  M  Seal,  i  am  running  trial  on  2  pieces,  but  wanted  to  know  if  any  one  has  tried  this  instead  of  using  screws,  thermal  tape  etc
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shyamhegde
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PostPosted: Sat May 07, 2016 3:24 pm Post subject: Re: any one tried joining LED on heat sink using Silicon RTV Reply with quote

 I  suggest  not  to  compromise  on  mechanism  of   transfer  heat  from  LED  to  heat  sink  which  is  the  main  factor  for  life  and  performance  of  LED.
 Silicone  is  surely  poor  in  the  thermal  conductivity  compared  to  thermal  compound  paste  or  tape.  You  also  get  thermal  epoxy   which  acts  like  both  adhesive  and  thermal   compound  .  artctic  silver,  loctite  etc  have  it.  Cost  is  higher  though.  also  there  is  one  thermal  adhesive  (Chinese  brand)  I  bought  once  from  eBay  India  from  seller  btree  and  it  did  decent  job  too  for  my  non  aquarium  LED  projects  .
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syed
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PostPosted: Sun May 08, 2016 10:01 pm Post subject: Re: any one tried joining LED on heat sink using Silicon RTV Reply with quote

 i  have  used  thermal  tape  in  past  but  led  kept  falling  of  and  then  i  had  to  use  the  screws.
 
 i  was  thinking  of  using  the  silicon  on  side  and  in  middle  have  thick  coating  of  thermal  past.  Let  me  see  ebay  for  the  thermal  adhesive  also
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Mortis
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PostPosted: Mon May 09, 2016 1:51 am Post subject: Re: any one tried joining LED on heat sink using Silicon RTV Reply with quote

 Hey  dont  put  thermal  paste  on  too  thick.  Just  a  thin  layer  in  the  middle  and  press  it  against  the  heatsink.  To  fix  it  you  can  use  a  small  blob  of  araldite  or  superglue  on  one  or  2  outer  edges  of  the  star.  That  way  you   can  simply  pry  off  the  LED  from  one  of  the  non  glued  ends  if  you  have  to  remove  the  LED
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asheesh
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PostPosted: Tue May 10, 2016 9:10 pm Post subject: Re: any one tried joining LED on heat sink using Silicon RTV Reply with quote

 mix  thermal  paste  with  Silicon  4:1  Ratio  it  would  be  perfect.
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Preeths
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PostPosted: Wed May 11, 2016 12:34 pm Post subject: Re: any one tried joining LED on heat sink using Silicon RTV Reply with quote

 A  thermal  paste  is  used  to  conduct  heat  from  your  LED  to  the  heat  sink.  Use  a  good  quality  thermal  paste.  A  thin  even  application  should  be  done.
 Silicone  acts  like  an  insulator  and  will  get  brittle  with  repeated  heating  and  cooling.  You  will  burn  you  LED's  due  to  excess  heat  if  you  use  Silicone.
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