R05200 pure tantalum plates & sheets are medium and thick-gauge plate products (usually 0.5mm—20mm in thickness) processed through multiple precision procedures including vacuum melting, hot rolling, cold rolling, and annealing, using high-purity commercially pure tantalum (Ta content ≥ 99.95%, complying with American Standard R05200 grade) as raw material. As https://www.yjmetals.com/high-quality-pure-tantalum-plates-sheets-product/