When sourcing IQF (Individually Quick Frozen) products, the core technical requirement is the freezing speed and temperature. The process must pass through the 'maximum ice crystal formation zone' (typically -1°C to -5°C) rapidly to prevent cell wall rupture. Ensure the supplier maintains a core temperature of -18°C or lower throughout the process. You should verify the drip loss rate after thawing; high-quality IQF products should have a drip loss of less than 5%, preserving the original texture, flavor, and nutritional value.