cleanroom

**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.