Thursday, February 11, 2010

Pewter

The malleable metal alloy; traditionally between %85 and %99 tin, with the remainder consisting of lead, copper, antimony and bismuth, has a low melting point, around 170–230°C, depending on the exact mixture of metals:

Pewter
Copper and antimony act as hardeners while lead is common in the lower grades of pewter by having a bluish tint. Modern pewters must contain at least 90% tin and be alloyed with copper, antimony or bismuth to be considered a pewter. Lead is no longer permitted to be an alloying element. Older pewters with higher lead content are heavier, tarnish faster and oxidation gives them a darker silver-grey color. [Reference:
http://en.wikipedia.org/wiki/Pewter]

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