Change the Pb to Sn and you have a standard Sn/Ag eutectic. Makes more sense methinks.......... Regards Ian Fox Lead Materials and Process Engineer Aero Engine Controls A Rolls-Royce plc and Goodrich Corporation Joint Venture York Road Hall Green Birmingham B28 8LN Tel: +44 90)121 607 3763 Fax: +44 900121 6076358 email: [log in to unmask] -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman Sent: 11 February 2010 20:32 To: [log in to unmask] Subject: Re: [TN] Old reference for silver solder - what's it cross ref to? Hi Jeff - I do have a 95Pb/5Ag solder alloy in my solder alloy charts but don't have a 94Pb/6Ag. But your logic makes the most sense so far. Dave "McGlaughlin, Jeffrey A" <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 02/11/2010 01:45 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to "McGlaughlin, Jeffrey A" <[log in to unmask]> To [log in to unmask] cc Subject Re: [TN] Old reference for silver solder - what's it cross ref to? I think the 94LTS was the designation for "Low Temperature Silver Solder" and was 94Pb/6Ag. I have an old chart for this somewhere but can't lay hands on it right now. Jeffrey A McGlaughlin, CID Engineering Designer Battelle 505 King Ave Columbus Ohio 43201-2693 Phone (614)424-7582 -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David D. Hillman Sent: Thursday, February 11, 2010 2:24 PM To: [log in to unmask] Subject: Re: [TN] Old reference for silver solder - what's it cross ref to? Hi Graham - well, ya got me stumped. I have access to all of the QQ-S-571 revisions from "B" and there is no "94" designation in the specification. That drawing note has to newer than QQ-S-571 Rev C, 1963, since that's when the R-RMA-RA convention was first used. The WRAP3 is easy - wire, RA flux, P3 flux core but the 94 LTS is a mystery. If I had to guess, the 94 LTS is a specific supplier alloy designation that has nothing to do with the 571 specification. And the "silver solder" reference is no help as that could be describing a solder alloy family or could be a slang term. Looks like someone created a drawing note mutation! Good Luck. Dave Graham Collins <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 02/11/2010 11:42 AM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to [log in to unmask] To [log in to unmask] cc Subject [TN] Old reference for silver solder - what's it cross ref to? Hello Technet I seem plagued with strange solder questions these days. Can somebody help with a cross-reference from an old solder callout to what this would be referred to as now? I have a drawing that references: "QQ-S-571 alloy 94LTS Type WRAP3", and refers to it as "silver solder". I can get the last version of QQ-S-571 (rev F, before it was cancelled and J-STD-006 adopted), but I do not see this type of callout. Does anyone have something that will tell me what's in this solder? Thanks! Graham Collins Halifax Production Engineering L-3 Communications ES ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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