They have got 99.99%

"All trials using a simple caustic baking leach process conclusively demonstrated that an ultra-high purity graphite product with >99.97% Carbon (“C”) can be produced from the Albany graphite deposit. The process was successfully applied to a variety of graphite concentrate samples that had initial carbon grades in the range of 46 – 90% using conventional flotation techniques. In all trials the final purity values were >99.97% C and up to 99.99% C in many cases, regardless of initial carbon grades."