The suffix is the impurity level. You can find all of this documented in
J-STD-006. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of ekalgren
Sent: Friday, January 05, 2007 1:51 PM
To: [log in to unmask]
Subject: Re: [TN] Solder Designations

Does the A or B refer to the metal's position in the composition
formula?

Sn60Pb40 = Sn60A
Sn62Pb36Ag02 = Pb36B
Sn63Pb37 = Sn63A

Eric Kalgren
Electrical Engineer
Cobham Defense Electronic Systems
Continental Microwave Division
11 Continental Drive
Exeter, NH  03833  USA
Tel:  603-775-5200
Fax: 603-775-5201
E-mail:[log in to unmask]
Website:  http://www.cobhamdes.com
 
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gregg A. Owens
Sent: Friday, January 05, 2007 12:29 PM
To: [log in to unmask]
Subject: [TN] Solder Designations

Dear Technetters:
 
I have had a student of mine ask a question which has stumped me, but
should (hopefully) be easy for our metallurgist folks out there. 
 
J-STD-001 3.2 Solder refers to Sn60A, Pb36B and Sn63A. To what specific
solder alloy do these designations apply? I have looked at J-STD-005B to
attempt to find these specific designations (specifically the inclusion
of "A" or "B") but without success. 
 
Any thoughts?
 
Gregg Owens, MIT
Manufacturing Technology Training Center, Inc.
Mira Loma, CA 91752 
 

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