Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


ADRIANO FERNANDES

#11795

MESH SIZE | 22 April, 1999

I would like to known what�s MESH SIZE mean in the solder paste specification ?

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#11796

Re: MESH SIZE | 22 April, 1999

| I would like to known what�s MESH SIZE mean in the solder paste specification ? | | Check out the thread from 4/14/99 on solder FINES vs. solder balls. The info you're looking for is in there.

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JJA

#11797

Re: MESH SIZE | 23 April, 1999

| | I would like to known what�s MESH SIZE mean in the solder paste specification ? | | | | | Check out the thread from 4/14/99 on solder FINES vs. solder balls. The info you're looking for is in there. | test

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Jeff Anweiler

#11798

Re: MESH SIZE | 23 April, 1999

| | I would like to known what�s MESH SIZE mean in the solder paste specification ? | | | | | Check out the thread from 4/14/99 on solder FINES vs. solder balls. The info you're looking for is in there. | "Mesh Size" is a term that is commonly used to describe the powder particle size in the solder paste mixture, but actually refers to the mesh screen size itself used to sort the powder. The mesh number gives the number of wires per inch of screen. For example, a 200 mesh screen has 200 wires per inch. Each wire is 52 microns in diameter, and the width of each opening in the screen is 75 microns. Consequently, a 200 mesh screen allows 75 micron and smaller particles to pass through. Two different size mesh screens are used to collect the desired powder size. Type 3 powder is the most commonly used size for standard SMT applications. Type 3 is -325+500 mesh size which corrolates to 25-45 microns or .0010"-.0018" powder particle size. Hope this helps, if you have further questions feel free to contact me. I'm with Indium Corporation and can be reached at janweiler@indium.com

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Cogiscan Track Trace Control

Solder Paste Inspection