Definition: Temperature range of -25°C to -40°C, colder than standard frozen storage. Used for long-term preservation and specific products requiring ultra-low temperatures.
Applications::
- Long-term frozen storage (1+ years)
- Ice cream manufacturing and hardening
- Seafood preservation
- Export products requiring extended shelf life
- Biological materials
R638 Requirements: Deep frozen products must be maintained at -18°C or colder, but storage at -25°C+ extends shelf life significantly.
Related Terms: Frozen, Blast Freezing, Ultra-Low Temperature