Five Nines Gold: When Purity Matters
What is Five Nines Gold?
“Five Nines” (5N or 99.999%) refers to an extraordinarily high level of gold purity — meaning that out of 100,000 parts, only one part is not gold. While this may sound negligible, even the tiniest trace of impurities can become critical in specific advanced applications.
Why Do Trace Impurities Matter?
In high-tech industries such as electronics, medical equipment, aerospace, or military applications, trace elements like lead, nickel, or silicon — even at parts-per-million (ppm) levels — can alter the behavior of gold films, compromise conductivity, or interfere with precision reactions.
Where Do You Find Five Nines Gold?
This ultra-pure gold is not used in bullion or jewelry but in cutting-edge technologies. Common forms include:
- Sputtering Targets – used in thin-film deposition processes for microchips, sensors, or coated optics.
- Evaporation Rods – employed in vacuum deposition systems or for high-purity collectors in nuclear processes.
- Granules – used in biomedical applications, chemical research, or to create alloys with precisely controlled properties.
How Is It Produced and Verified?
Achieving 99.999% purity requires repeated refining processes such as:
- Advanced electrolytic refining
- Zone refining (common in semiconductors)
- Controlled atmospheric melting
Certification of purity is performed using highly sensitive analytical tools:
- GDMS (Glow Discharge Mass Spectrometry)
- ICP-MS (Inductively Coupled Plasma Mass Spectrometry)
These can detect impurities at the parts-per-billion (ppb) level and are essential for validating that each batch meets strict specifications.
And the Cost?
Five Nines gold is significantly more expensive than standard 999.9 bullion. The higher cost reflects not just the raw gold content, but the extreme processing, testing, and contamination-control procedures involved. This product is typically manufactured and handled by specialty suppliers serving the semiconductor, defense, and research sectors.
What About Recycling?
In sputtering processes, surface uniformity is critical. As a result, targets are rarely used to completion — changes in the target’s surface during use can impact deposition quality. This leaves partially used targets that must be handled with care.
At A.G. Metals, we offer a professional recycling solution for 5N gold sputtering targets, including those bonded to copper backing plates. We also provide fresh 99.999% gold material with full documentation and traceability upon request.
Summary:
Five Nines Gold (99.999% purity, also known as 5N) is an ultra-pure form of gold used in high-tech industries where even minute impurities can disrupt performance. Unlike bullion gold, it appears in specialized forms such as sputtering targets, evaporation rods, and granules, and is essential for electronics, medical devices, aerospace, and defense applications.
Producing 5N gold requires advanced refining methods like electrolytic or zone refining, and verification with precision instruments such as GDMS and ICP-MS, capable of detecting trace elements at ppb levels. Due to the stringent production and testing, 5N gold is significantly more expensive than standard bullion.
Recycling is also critical: in processes like sputtering, only part of the target is used, as surface changes affect quality. A.G. Metals specializes in recycling partially used 5N targets (even when bonded to copper) and can supply fresh 99.999% gold with full certification upon request.
