Tom,

Most people that I talk to do not use the same stencil.   How clean is
clean?   If you are using an automated cleaning machine, the contaminants from
the leaded can get into the Pb free stencil.   Also, depending on the paste
you are using, the Pb Free stencil may be made 1:1 solder pads to your board
while the stencil for tin/lead may have reductions (the tin/lead solder
alloys tend to have better wetting than most Pb free alloys).

Kathy Jenczewski
MicroScreen

At 12:22 PM 11/30/2006 -0500, you wrote:
>Hello all,
>
>SMT Stencils - Can we use the same stencil that was used for leaded paste,
>for no-lead paste if they are properly cleaned?  What's your thoughts on
>this?
>
>Thanks
>
>Tom Parkinson
>Quality System Manager - CIT
>WinTronics, Inc.
>Phone: 724-981-5770 - extension 235
>
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