What's gunmetal?

G1 Max Pb= 1.5% C90500 Max Pb= 0.3%

G1 max Sn= 10.5% C90500 max Sn= 11%

G1 minimum Sn= 9.7% C90500 minimum Sn= 9%

They sure don't look exactly the same to me but my reference for C90500 may be different than yours.

I got the C90500 specs from

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This reference

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has C90500 with the same specs for Sn as G1 but gives 0.25% max for Pb in C90500.

If the G1 spec for lead is indeed 1.5% (max) then the two alloys are not the same.

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Unknown
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No, those are the same specs for C90500. What you're looking at is slight variations in the tolerance bands, for impurities and for basic composition.

That's true of all standards-equivalents. It just means that there are slight differences in the precision of the standard. The basic standard --

88-10-0-2 -- is the same for both.

You'll find this kind of slight variation everywhere, even between SAE and AISI specs for the same alloy-number of steels -- or you would, until they unified the systems.

Ed Huntress

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Ed Huntress

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