Art: There is not one simple answer. Many factors come into play.	
		1. Board material of construction			
		2. Board thickness					
		3. Degree of smear(how bad is it?)			
		4. Interface connect mechanism(els.Cu,direct metal,etc.)	
		5. Applied circuit power				
		6. Product use environment(mechanical shock, temp variations,	
		    vibration, g loads, frequency of these conditions etc.)	
		7. Product reliability and liability     		
	
I don't know if this is a hypothetical question or you're sitting on a box of	
expensive product and not sure what to do with it.You could try some "shake n 
bake" testing based on the worst type of condition it will be used in. This 
could give you an insight into the severity or degree of the problem and 
possibly weedout the bad product.					
									     
 Product application is a key player in this. My advice is if in doubt don't, 
 otherwise it could be really costly.					
									
					Regards				
						Michael Barmuta		
						Fluke Corp.		
						Everett Wa.		
						206-356-6076
 									
	    

On Wed, 16 Apr 1997 09:09:08 -0700 Art Shuler wrote:

> From: Art Shuler <[log in to unmask]>
> Date: Wed, 16 Apr 1997 09:09:08 -0700
> Subject: Resin Smear
> To: [log in to unmask]
> 
> Any opinions to the following question would be helpful:
> 
> Let's say a Multilayer PWB is known to have Resin Smear at the
> interconnects.  The board has been completely processed and installed in
> the unit, and the unit is working properly.  What are the chances of the
> Resin Smear propagating into complete separation after a period of time,
> causing the board to fail due to open circuits?
> 
> Art Shuler
> [log in to unmask]
> 
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