When purchasing Ferro Alloys (such as Ferro Silicon, Ferro Manganese, or Ferro Chrome), the most critical factor is the chemical composition, specifically the percentage of the primary element (e.g., Si, Mn, Cr). Buyers must also strictly monitor impurity levels of Carbon (C), Sulfur (S), Phosphorus (P), and Aluminum (Al), as these significantly impact the quality of the final steel or alloy. Additionally, specify the particle size distribution (granularity)—typically ranging from 10-50mm or 50-100mm—to ensure compatibility with your furnace charging system.