When sourcing PFP products, the most critical factor is the Fire Resistance Rating (FRR), typically measured in minutes (e.g., 30, 60, 90, or 120 mins). You must verify the material composition, such as intumescent coatings, fire-rated boards (calcium silicate or gypsum), or mineral wool batts. For coatings, check the Dry Film Thickness (DFT) requirements to achieve specific ratings. Additionally, ensure the products have low smoke toxicity and flame spread indices to meet safety benchmarks for high-occupancy buildings.