This final surface finish does NOT appear to be a HASL process.  Unless, the air knives pressure was so high that it did not leave ANY RIPPLES of the copper pad surface.
Victor,

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Mike Fenner
Sent: Wednesday, November 20, 2013 1:52 PM
To: [log in to unmask]
Subject: Re: [TN] Final Surface finish

Theoretically also PB-free HASL, I say theoretically because the usual alloy is Sn/Cu or modified Sn/Cu on cost grounds.

Regards

Mike Fenner
Bonding Services & Products
M: +44 [0] 7810 526 317
T: +44 [0] 1865 522 663
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of GRIVON Arnaud
Sent: Wednesday, November 20, 2013 5:19 PM
To: [log in to unmask]
Subject: Re: [TN] Final Surface finish

Immersion Tin?
Ag is known to be the anti-whisker additive for most chemistries.
Best regards,

Arnaud Grivon
PCB/PCBA Technology Expert
Thales Global Services - ESS (Engineering Shared Services) 18, avenue du Maréchal Juin Bât. C - Bureau C2-135
92366 Meudon-la-Forêt Cedex
France
Tél : (+33) (0)1 70 28 23 88

Visit our website : http://www.thalesgroup.com

[@@ THALES GROUP INTERNAL @@]


-----Message d'origine-----
De : TechNet [mailto:[log in to unmask]] De la part de Victor Hernandez Envoyé : mercredi 20 novembre 2013 18:15 À : [log in to unmask] Objet : [TN] Final Surface finish

Fellow TechNetters:

   Is there a final surface finish which has a high tin content along with
some silver.   It is not the traditional ImAg.   The finish appears somewhat
dull with good coverage on the edges of copper features.

Victor,


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