chemical delivery system

Chemical delivery systems automate mixing, blending, dilution, and dispensing of liquid chemicals to semiconductor process tools. **Functions**: Store chemical inventory, blend formulations, dilute with DI water, deliver precise volumes, track usage. **Components**: Chemical storage drums or tanks, pumps, flow meters, mixing vessels, filters, delivery manifolds, control systems. **Automation**: Recipes define chemical mix ratios. System blends automatically. Eliminates manual mixing errors. **Purity maintenance**: Closed system minimizes contamination. High-purity materials throughout. **Chemical types delivered**: Wet etch chemistries, photoresist developers, CMP slurries, cleaning solutions, rinse chemicals. **Volume control**: Precise metering for process repeatability. Mass flow or volumetric measurement. **Safety**: Double containment, leak detection, emergency shutoff, chemical-compatible materials, exhausted enclosures. **Monitoring**: Track chemical levels, usage rates, blend accuracy, delivery pressure. Automated reordering. **Day tanks**: Smaller tanks near tools for immediate supply, fed from central storage. **Waste handling**: Return lines for unused chemicals, connection to waste treatment.