Dave,

This figure is for an inert atmosphere - under e.g. flux it will be different
e.g. Klein Wassink in "Soldering in electronics" shows figures between 0.41 and
0.33 N/m for solder under colophony flux with activations between 0 and 1%
respectively!

In our own experiments we measured a value of 0.426 N/m for multicore NA
colophony at 235C (D.C.Whalley & P.P.Conway "The globule block wetting
balance test",
Transactions of the ASME: Journal of Electronic Packaging, Vol.118:134-141,
No. 3,
September 1996).

David Whalley
Loughborough University


At 07:01 31/03/97 cst, you wrote:
>     Hi TechNet!
>     
>     The surface tension for alloy Sn60/Pb40 at 500 C is 472 mN/meter. The 
>     source of the value is Tin Research Institute data.
>     
>     
>     Dave Hillman
>     Rockwell Collins
>     [log in to unmask]
>
>
>______________________________ Reply Separator
_________________________________
>Subject: Surface tension of molten Pb/Sn
>Author:  [log in to unmask] at ccmgw1
>Date:    3/30/97 5:06 AM
>
>
>     Hello,
>     
>     I need the surface tension of the eutectic solder Pb/Sn.

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