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Irascible
11-05-2012, 03:55 PM
On a bar of solder marked 70/30 or 30/70 or even 60/40, does the first or second number indicate the tin?
trying2learn
11-05-2012, 04:02 PM
My understanding is its rhe first number is the tin percentage.

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machanic
11-05-2012, 04:13 PM
Ditto on that, first # tin percentage
Defcon-One
11-06-2012, 05:58 PM
They are correct (The first number is the TIN):

70/30 would be 70% Tin, 30% Lead.

30/70 would be 30% Tin, 70% Lead.

60/40 is 60% Tin, 40% Lead.