Lead free alloys come in 2 types: generic and proprietary/patented.  The more alloying additions the more likely the alloy is to fall into the second category.
Generic alloys are available from just about any recognised solder manufacturer, proprietary alloys are available from the patent holder and any licensees.
If the alloy has actual or perceived merit for general industry use then it is likely you will find that other manufacturers have licensed it and you can again obtain it from just about any recognised manufacturer
 

Kind Regards

Mike Fenner

Applications Engineer, European Operations
Indium Corporation
 T: + 44 1908 580 400
M: + 44 7810 526 317
 F: + 44 1908 580 411
 E: [log in to unmask]
W: www.indium.com 
Leadfree: www.Pb-Free.com

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of [log in to unmask]
Sent: Thursday, January 24, 2002 9:00 PM
To: [log in to unmask]
Subject: [TN] Lead replacement solder alloys

Who is the procurement source for a couple of the newer Sn 63 like solders that have somewhat better properties than Sn63.  Specifically they are the SnAgCuSb and SnAgCuZn alloys.

Thanks
Phil Hinton