Hi Phil --ORH1 is organic high activity flux (halides >2% ). If these
residues get trapped you can have corrosion/migration issues. You may
want to request flux manufacturer to give you a ORH0 High activity ( 0%
halide) or ORMO - Medium activity ( 0% halide) , or ORLO- low activity
( 0% halide) . You may need to evaluate these fluxes  for proper
wettability of the solder to get optimum activity flux. 

Mumtaz

Mumtaz Bora

Senior Packaging Engineer

Peregrine Semiconductor

9380 Carroll Park Drive

San Diego, CA 92121

858-795-0112-direct

858-731-9499 -fax

[log in to unmask]

 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Bavaro
Sent: Monday, October 10, 2011 4:49 PM
To: [log in to unmask]
Subject: [TN] ORH1 flux residues

I have a PWA with a gasket beneath a large thru hole power device.  
The gasket has holes punched in it for each of the pins. 
The device is hand soldered flush to the PWB.  
The operator uses external liquid flux along with core solder with flux
in it.  
The assembly is later washed and it passes ionics testing.  

The problem is that this gasket effectively seals the top side solder
connections from the cleaning process.  


My question is this:

How much should I be worrying about the existing hardware which has flux
residues sealed under the power device?
The assembly is stored with the power off.
The flux used is water soluble and classified as ORH1.
For future builds we are modifying the gasket so that the topside
connections can be cleaned (cutout "u" shape intead of round holes).



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