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Old January 3, 2012, 10:46 PM   #1
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picked up some lead alloy, need identification

I picked up some bars of lead alloy a few weeks ago while cleaning out an old garage. some of the bars are marked "National Lead 666", a few are marked MF 50/50, and some Kester 30/70. I did google and found the 666 was 39% tin, 1% antimony, and 66% lead. I could not find anything about he others, I assume the 50/50 is half lead half tin? What is the 30/70? 30 tin, 70 lead?

Any help is appreciated.

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Old January 3, 2012, 10:58 PM   #2
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From my research Kester is a solder company. I would guess your assumptions are correct, but with one little correction in your math:

National lead's 666 alloy was 39% tin, 1% antimony, and 60% lead

But we knew what ya meant

Did you find any 111 markings on the 50/50 stamped bars. Supposedly that was National lead's marking for their 50/50 alloy (lead to tin)?

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Old January 6, 2012, 07:55 PM   #3
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30/70 (30% tin, 70% lead), was the alloy used in the early 60's to fill car bodies (pre-bondo), to make "lead sleds".
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