Thanks for the link.
It's important to note the reason why GW kaolin is the key.
As you can imagine 99.999% purity is close to alchemy! Each step risks adding back impurities. That's what makes GW kaolin so valuable. It's all very well producing HPA5N in a lab but at full commercial scale things can go wrong so the simpler the process the better. Hopefully finetuning can get from 99.9985 to 99.999.
HPA4N & 5N, page-12
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