Badcaps.net Forum
Go Back   Badcaps Forums > General Topics > General Capacitor Questions & Issues
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 01-31-2023, 09:41 PM   #1
paulstevens
New Member
 
Join Date: Jan 2023
City & State: Sacramento, CA
My Country: USA
I'm a: Knowledge Seeker
Posts: 13
Default White Compound on Electrolytic Caps

Hello, what is the white compound used to "glue" capacitors down to a board so they don't vibrate? Is it RTV? Does it have an official name or function?

What I am really asking is what can I use to replace it when I find it broken or cracked on boards I am looking at.

Thank you.
paulstevens is offline   Reply With Quote
Old 01-31-2023, 09:59 PM   #2
stj
Great Sage 齊天大聖
 
stj's Avatar
 
Join Date: Dec 2009
City & State: Europe
My Country: some shithole run by Israeli agents
I'm a: Professional Tech
Posts: 29,083
Default Re: White Compound on Electrolytic Caps

it's neutral-base rtv
be carefull because the cheap stuff sold for bathrooms is either acid-base or alkaline-base and will do damage.

you dont really need it.
stj is offline   Reply With Quote
Old 02-01-2023, 02:36 AM   #3
paulstevens
New Member
 
Join Date: Jan 2023
City & State: Sacramento, CA
My Country: USA
I'm a: Knowledge Seeker
Posts: 13
Default Re: White Compound on Electrolytic Caps

Thanks. I'm working on a Yamaha RX-A3050 and have the Digital PCB out. The RTV securing one of the two giant electrolytic caps on the power board has cracked, and I can rock the cap back and forth. I was planning to remove the power board to verify the solder joints of that cap (and the others) and wanted to fix it right, hence the question about the RTV.

If I don't need it I probably won't bother with it.

Why is it there? To keep them secure during transportation? Or some functional reason?

Thanks.
paulstevens is offline   Reply With Quote
Old 02-01-2023, 05:42 AM   #4
andrewsawesomr
Member
 
Join Date: Jun 2022
City & State: Nazareth, Pennsylvania
My Country: United States of America
Line Voltage: 120VAC 60Hz
I'm a: Knowledge Seeker
Posts: 63
Default Re: White Compound on Electrolytic Caps

Quote:
Originally Posted by paulstevens View Post
Why is it there? To keep them secure during transportation? Or some functional reason?
It's usually there to prevent cracked solder joints/damaged components from occurring during the shipping process or from vibration from something like a transformer.
andrewsawesomr is offline   Reply With Quote
Old 02-01-2023, 05:53 AM   #5
diif
Badcaps Veteran
 
Join Date: Feb 2014
City & State: Midlands
My Country: England
I'm a: Professional Tech
Posts: 6,781
Default Re: White Compound on Electrolytic Caps

It's also added to aid in manufacturing, holding components in place for soldering.
diif is offline   Reply With Quote
Old 02-01-2023, 09:29 AM   #6
paulstevens
New Member
 
Join Date: Jan 2023
City & State: Sacramento, CA
My Country: USA
I'm a: Knowledge Seeker
Posts: 13
Default Re: White Compound on Electrolytic Caps

Thanks everyone. I appreciate the help and info!
paulstevens is offline   Reply With Quote
Old 02-05-2023, 02:20 PM   #7
Galraedia
New Member
 
Join Date: Jun 2012
City & State: Norfolk, VA
My Country: USA
I'm a: Knowledge Seeker
Posts: 7
Default Re: White Compound on Electrolytic Caps

It's non acidic silicone glue. You can find it on places like eBay using terms such as "thermal adhesive" or "heatsink plaster". It's used to hold components in place, insulate them from dust and moisture, and used as a thermal adhesive between chips and heat sinks.
Galraedia is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2023
Powered by vBulletin ®
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 02:04 PM.
Did you find this forum helpful?