This article provides a comprehensive guide on when to use caustic soda, how to use it safely, and when you should opt for alternative solutions. What is Caustic Soda and Why Use It?
: Mix 1 liter of cold water with roughly 60g (about 3–4 tablespoons) of caustic soda flakes in a plastic bucket. Always add the soda to the water , never the other way around, to prevent a dangerous "spit back" reaction. caustic soda for outside drains
| Pipe material | Resistance to NaOH | Notes | |---------------|--------------------|-------| | PVC (uPVC) | Moderate | Safe up to 10% conc. & <60°C; high heat may warp. | | ABS | Moderate | Similar to PVC, but softer. | | Cast iron | High | Heat cycles can crack old brittle iron. | | Copper | Low | NaOH attacks copper over time (blue-green corrosion). | | Galvanized steel | Very low | Rapid corrosion, pinholing. | | Concrete/Clay | High | Safe but heat + cold water can crack clay. | This article provides a comprehensive guide on when