Semiconductor cleanrooms are ultra-controlled manufacturing environments rated Class 1-10 ISO — maintaining air purity 10,000+ times cleaner than hospital operating rooms, where a single dust particle can cause chip defects on features measured in nanometers.

Cleanroom Classes

• Class 1 (ISO 3): <1 particle ≥0.5μm per ft³ — critical lithography areas.
• Class 10 (ISO 4): <10 particles — most wafer processing areas.
• Class 100 (ISO 5): <100 particles — support areas, gowning rooms.
• Class 1000 (ISO 6): Less critical assembly and test areas.

Key Controls

• HEPA/ULPA Filtration: 99.999%+ particle removal.
• Laminar Airflow: Vertical unidirectional flow prevents contamination.
• Gowning: Full bunny suits, double gloves, face masks.
• Temperature: ±0.1°C control for lithography areas.
• Humidity: ±1% RH for consistent photoresist performance.
• Vibration: Sub-micron isolation for lithography tools.

Cleanrooms are the fundamental enabler of semiconductor manufacturing — without particle-free environments, modern chip fabrication at nanometer scales would be impossible.