When sourcing advanced materials, you must prioritize mechanical properties such as tensile strength, elasticity modulus, and impact resistance. For polymers or composites, verify the Glass Transition Temperature (Tg) and thermal stability. If the material is intended for construction or electronics, ensure it has a certified Flame Retardant Rating (e.g., UL94 V-0). Always request a Technical Data Sheet (TDS) and a Material Safety Data Sheet (MSDS) to confirm chemical composition and handling safety.