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June 2009

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Subject:
From:
Joe Fjelstad <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Fri, 5 Jun 2009 12:52:13 EDT
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Well done Dewey
 
Might want to add vapor or vacuum deposition in there  somewhere. 
 
Might also want for the purposes of this industry to make reference to the  
fact that they typically allow access to required terminations  and that 
they impede. limit or may obviate rework and repair depending  on materials 
and process.   
 
For glob top you might add that they are cured in place. 
 
All the best, 
Joe
     
 
 
 
 
 
In a message dated 6/5/2009 8:33:59 A.M. Pacific Daylight Time,  
[log in to unmask] writes:

ENCAPSULATION

Encapsulation is the encasement of a component  in a resin coating by 
dipping, spraying, or embedding with or without a mold.  Encapsulants can be 
designated as potting compounds, glob-topped or molding  compounds.



POTTING

Potting involves surrounding the  component housed in a container with a 
liquid resin which is then cured in  place. The container becomes an integral 
part of the system such that the  critical property that needs to be 
maintained is the interfacial adhesion  between the container and the cured resin 
system for an optimum long-lasting  reliable package.



CASTING OR EMBEDDING

Casting is  similar to potting except (you don't inhale)¹ that the 
container or mold is  removed from the part after curing.



GLOB-TOPPED  ENCAPSULATION

Glob-topped encapsulants consist of very viscous  compounds that are 
usually applied to a PB or other substrate  .



MOLDING

Molding can be a general category of  encapsulation. This is one of my 
areas of expertise so I'll spare you the  pressing details. 



IMPREGNATION²

Impregnation is defined  as process for the filling of voids and 
interstices of a material with a  liquid resin. Some of the types are as follows:

*    TRICKLE  IMPREGNATION
*    VACUUM IMPREGNATION
*     VACUUM-PRESSURE IMPREGNATION
*    REINFORCEMENT  IMPREGNATION



Note 1 - Establishing a precedent

Note 2 -  Potential follow-up process to  embedment


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