Toyo Tanso USA has various purification vessels that remove metallic impurities from graphite. We use multiple halogens to remove these impurities at high temperatures. Toyo Tanso guarantees to provide graphite that has been purified with ash levels below 5ppm. Toyo also can provide an augmented process that utilizes Argon as a carrier gas to provide exceptionally low levels of Boron and Nitrogen. Our goal is to set the industry standard for high purity products. These products have served to be important to our customers requiring elevated performance. These purer products will help yield the results you desire for that performance.