White glue?

[Vasquo]

What is that white glue I often see in amps/power supplies... I often see it around caps, or around soldered wires on PCB, and some components.

What is the name of that white glue stuff? Any URL link you can share on where to get this? Thanks.

 

[Sangram]

Can't believe no one answered this yet

https://www.google.co.in/search?q=hot+melt+glue

You need a glue gun and it takes a stick of glue, the heating element melts the glue, you put it where it's supposed to go, and when it cools it hardens to its original consistency.

If however, you need to change something afterwards....

 

[Vasquo]

No, it's not hot melt glue. That feels "rubbery".

Here's a photo. It's also used in between capacitors. It's very hard.

 

[Mooly]

The "white glue" used by manufacturers over the years has been the cause of countless failures of equipment in service, breaking down over time and becoming conductive. Its purpose is to relieve mechanical stress on wire joints and components.

 

[ashok]

You did not do your homework ! No excuses for that.
Google is everyone's bible and you chose to ignore it !

There is so much info on this that it's silly to copy paste it here.
Here is ONE link!
What kind of glue should I use for PCB-mounted components to avoid vibrations? - Electrical Engineering Stack Exchange

Search for more if you want additional info. As you can see it's not a short single paragraph answer !

 

[Kiriakos]

The "white glue" used by manufacturers over the years has been the cause of countless failures of equipment in service, breaking down over time and becoming conductive.

You can not blame the glue, but the one who selected this material in a specific application.
From the other hand, stability of chemicals in high temperature it can not be easily verified by electronic products manufacturers, most of them shown blind trust to their supplier.

Its purpose is to relieve mechanical stress on wire joints and components.

Yes this is what it does, and I found lots of neoprene based adhesive, over and around of parts in my Philips crossover networks, I got identical glue chemistry and add some of it over new components.

Neoprene based adhesive or also named as benzine - Glue, seems more like as a soft silicone gel, and this makes it removal much easier.

 

[marce]

Silicone is often used, as Mooly said its for vibration relief. It is more often used on electrolytic caps as these tend to have a large body on little legs (especially SMD caps) and when you do vibration/ballistic testing (mill/aero levels) you tip them all out of the bottom of the case because production has forgotten to silicone them.

 

[JMFahey]

Cheap window sealing grade silicone has tons of acetic acid as stabilizer (it starts curing when acetic acid ecaporates) which can/will chemically attack copper.

Talk about sleeping withn the enemy.

Of course a ring around a capacitor can does not do damage,but beware where it touches naked copper.

Personally I use somewhat thick toluene based neoprene adhesive (the same I use for reconing and Tolexing cabinets so I always have lots of it around) which after a couple days sticks real well.

 

[marce]

http://www.google.co.uk/url?sa=t&rc...JfooanXU95H2puyMNYNoglg&bvm=bv.75775273,d.ZGU

There are different grades and many designed for electronics, there are even a silicone based potting compounds.

 

[Vasquo]

Very helpful, marce. Thanks.

 

[marce]

If you want vibration and moisture protection have a look at this:
https://www.youtube.com/watch?v=buMebq_GXq4

Its basically hot melt glue.