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Limits RegistryThe Avogadro Project produced silicon-28 enriched to 99.9998% isotopic purity, machined into nearly perfect 1-kilogram spheres accurate to roughly 0.3 parts per billion in mass — among the purest and most precisely characterized macroscopic objects ever made, used to independently measure the Avogadro constant ahead of the 2019 redefinition of the SI kilogram.
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The Avogadro Project produced silicon-28 enriched to 99.9998% isotopic purity, machined into nearly perfect 1-kilogram spheres accurate to roughly 0.3 parts per billion in mass — among the purest and most precisely characterized macroscopic objects ever made, used to independently measure the Avogadro constant ahead of the 2019 redefinition of the SI kilogram.
The highest chemical and isotopic purity achieved in bulk silicon, as produced for the international Avogadro Project's silicon sphere used to help redefine the kilogram.
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Permanent ID limitsregistry.com/limits/LR-HIGHEST-PURITY-SILICON-EVER-PRODUCED
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Limits Registry. LR-HIGHEST-PURITY-SILICON-EVER-PRODUCED. Highest-purity silicon ever manufactured. 2026.