Legor low nickel release line is renewed

What role does rhodium play in the formulation of low nickel release white gold alloys?

The presence of rhodium in alloys of this type is strictly necessary, as rhodium is the only element capable of giving stability in the nickel release result.

Our R&D laboratory has implemented the NI1811 line of low nickel release alloys of 750 ‰ (18 Kt) white gold. The main advantage over previous versions is the lower amount of rhodium. This is the result of a research process aimed at verifying what is the minimum rhodium title necessary to give stability to the result. Like traditional NI1811 alloys, the alloys of this new line also fall within the limits established by the legislation.

The new Legor low nickel release line codes






In Europe, the production and marketing of jewelry that does not comply with the UNI EN 1811: 2015 standard (Ni release > 0,5 μg/cm²/week) is forbidden! The standard allows, due to the uncertainty of measurement, values of nickel release lower than 0.88 μg/cm²/week as conforming, on parts in direct and prolonged contact with the skin. The value lowers to 0,35 μg/cm²/week for elements in contact with perforated skin

NI1811 alloys compared with traditional alloys

Based on the statistics deriving from more than 4000 nickel release tests, carried out in our laboratories on samples from the market, we can state the following:

NI1811 alloys

The average nickel release value on NI1811 alloys at 750‰ is: 0,12 μg/cm²/week.

The percentage of compliance on NI1811 alloy samples at 750‰ is: 99,1%

Traditional alloys

The average nickel release value on traditional alloys at 750‰ is: 0,52 μg/cm²/sett.

The percentage of compliance on traditional alloy samples at 750‰ is: 80,5%

only 1 case out of 100 is not compliant with the legislation
This means that a traditional alloy has a risk of 1 in 5 cases of being NOT CONFORMING to the UNI EN 1811:2015 standard

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