component glue

Hayden · 5th October 2005, 01:33 PM

One question, why do they glue down the components in electrical devices like amps? the non silicone based stuff causes problems, but why glue reservoir caps? their not going to move
why glue transistors?

AuroraB · 5th October 2005, 08:55 PM

several reasons... mainly to fix larger components, like reservoirs, to minimize mechanical strain on the solder joints, -also to fix components before wave soldering, - glue also used to fix for reflow soldering

Loial · 6th October 2005, 03:55 AM

As AuroraB said, it is used mainly to reduce mechanical strain on the solder joints, they're not made for mechanical stress, even very small strains can weaken the best solder. In amplifiers standing still in your living room, it may not be obvious, but the product has been shipped, and we all know how well treated stuff are in shipping...
Also during thermal stress, the mechanical forces vary.
Gluing of transistors and other components can also be made by hermal reasons, to thermally couple transistors, sensors, etc. with a thermally conductive glue.

Hayden · 7th October 2005, 12:30 PM

True I can under stand that but the non silicon based glue goes dark its highly conductive and corrosive I cant see anything more worse to put in a amp than that glue, its like acid it eats the legs off diodes, shorts transistors out and makes the board go black I have fixed a lot of jobs mainly amps that have that glue, the white silicon stuff seems to be ok.

It’s like a ticking time bomb!!!!!!!!!!!

mzzj · 7th October 2005, 03:03 PM

Quote:

Originally posted by Hayden
True I can under stand that but the non silicon based glue goes dark its highly conductive and corrosive I cant see anything more worse to put in a amp than that glue, its like acid it eats the legs off diodes, shorts transistors out and makes the board go black I have fixed a lot of jobs mainly amps that have that glue, the white silicon stuff seems to be ok.

It’s like a ticking time bomb!!!!!!!!!!!

Come on, how manufacturer can sell new products if old ones last forever.

If they end up with too reliable product they add some acid-glue... They have different composition for products with 2 or 5 years warranty

Needless to say that hate that stuff, real annoying to scrape it off and look for missing component legs.

AndrewT · 7th October 2005, 06:42 PM

Hi,
to reduce the fatigue caused by vibration.

5th October 2005, 01:33 PM	#1
Hayden diyAudio Member Join Date: Aug 2004 Location: Mackay Australia	component glue One question, why do they glue down the components in electrical devices like amps? the non silicone based stuff causes problems, but why glue reservoir caps? their not going to move why glue transistors?

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5th October 2005, 08:55 PM	#2
AuroraB diyAudio Member Join Date: May 2001 Location: Norway, -north of the moral circle..	several reasons... mainly to fix larger components, like reservoirs, to minimize mechanical strain on the solder joints, -also to fix components before wave soldering, - glue also used to fix for reflow soldering

6th October 2005, 03:55 AM	#3
Loial diyAudio Member Join Date: Nov 2004 Location: Gävle	As AuroraB said, it is used mainly to reduce mechanical strain on the solder joints, they're not made for mechanical stress, even very small strains can weaken the best solder. In amplifiers standing still in your living room, it may not be obvious, but the product has been shipped, and we all know how well treated stuff are in shipping... Also during thermal stress, the mechanical forces vary. Gluing of transistors and other components can also be made by hermal reasons, to thermally couple transistors, sensors, etc. with a thermally conductive glue.

7th October 2005, 12:30 PM	#4
Hayden diyAudio Member Join Date: Aug 2004 Location: Mackay Australia	True I can under stand that but the non silicon based glue goes dark its highly conductive and corrosive I cant see anything more worse to put in a amp than that glue, its like acid it eats the legs off diodes, shorts transistors out and makes the board go black I have fixed a lot of jobs mainly amps that have that glue, the white silicon stuff seems to be ok. It’s like a ticking time bomb!!!!!!!!!!!

7th October 2005, 06:42 PM	#6
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, to reduce the fatigue caused by vibration.