Buyers must prioritize Fixed Carbon content, which typically ranges from 90% to 99% depending on whether it is green or calcined. Equally critical is the Sulfur content; 'Low Sulfur' petcoke (<0.5%) is premium for carbon additives, while 'High Sulfur' (>3%) is generally used for fuel. Additionally, verify the Particle Size Distribution (Mesh) to ensure it meets your specific industrial application, and check the Ash and Volatile Matter content, as lower levels indicate higher purity and better thermal efficiency.