Ferric Chloride (FeCl₃) is a chemical compound widely used as an etching solution for printed circuit boards (PCBs) and in water treatment as a coagulant. In electronics, it efficiently removes unwanted copper from PCB surfaces, leaving only the desired conductive tracks. It appears as a dark brown crystalline solid or concentrated solution and is highly soluble in water.
Ferric chloride is a corrosive substance and should be handled with gloves, goggles, and proper ventilation.
| Parameter | Specification |
|---|---|
| Chemical Formula | FeCl₃ |
| Appearance | Dark brown crystalline solid or yellow-brown solution |
| Molar Mass | 162.2 g/mol |
| Solubility | Highly soluble in water |
| pH (solution) | ~1–2 (acidic) |
| Uses | PCB copper etching, water treatment, sewage processing |
| Storage | Store in airtight container, away from moisture |
| Safety | Corrosive – causes burns; avoid skin/eye contact and inhalation |
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