I think it's only a matter of time. Have they achieved 5N in the true sense (impurities of 10ppm or less) in the past? The 13 March 2019 ann where they say they achieved 5N had impurities greater than 10. As far as I can tell they have only reached 99.999% with the help of rounding.
FYI Price at posting:
41.0¢ Sentiment: Buy Disclosure: Held
