Electronics > Projects, Designs, and Technical Stuff

What´s the purpose of the white gunk?

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arildj78:
What is the purpose of the white gunk on the solder terminals of both the inductors on this dual channel DC-DC converter?
The rest of the board has conformal coating, but for some reason theses inductors have been given special attention.

twospoons:
Looks like glue intended to stop the inductors falling off under vibration. 
They are heavy compared to their solder pad area, and as a result more vulnerable to joint failure under vibration.

gnuarm:
The white, soft stuff is not going to do diddly for a part that is soldered onto the board.  The soft stuff would allow the inductors to move without becoming detached, perhaps, but only after the much more rigid solder has long since broken. 

Bud:
To dampen the inductors' singing ..?

Swainster:
Hold the inductors in place during THT component assembly?

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