China has developed a device capable of producing 99.99997% pure helium, exceeding threshold of 99.9999%

https://www.chinadaily.com.cn/a/202508/26/WS68ad0920a3108622abc9d1fe.html

"average helium in China's natural gas fields only 0.03 to 0.05%, far lower than 1 to 7% for international fields... system can operate around the clock, extracting 400,000 cubic meters of high purity helium annually... catalytic dehydrogenation removes hydrogen impurities, followed by membrane separation and pressure swing adsorption eliminating gases such as nitrogen and methane, then ultra-low-temperature refining removing neon"