Potassium Hydroxide 50% (KOH, CAS 1310-58-3) is a clear, colorless, strongly caustic solution with a specific gravity of about 1.50. It stays liquid at lower temperatures than 50% caustic soda, which makes it easier to store outdoors in cold climates. Liquid KOH is used in detergent and soap making, potassium chemicals, de-icers, oil and gas processing, metal cleaning and pH control. Use the compatibility ratings to choose the right tank resin, fittings and gaskets.
Safety data: Potassium Hydroxide 30–55% Safety Data Sheet (SDS) – Olin
HDPE is the most economical tank material for Potassium Hydroxide 50%, rated Excellent. Polypropylene is also rated Good or better. Avoid PVDF (Kynar®) tanks, PVDF fittings and aluminum hardware. Rated Fair (contact us before use): nylon tanks.
How Potassium Hydroxide 50% works with the plastics used to make our storage tanks.
| Material | Rating |
|---|---|
| HDPE | |
| Polypropylene | |
| Nylon | |
| PVDF (Kynar®) |
How Potassium Hydroxide 50% works with the plastics used for tank fittings.
| Material | Rating |
|---|---|
| HDPE | |
| PVC | |
| CPVC | |
| Polypropylene | |
| PVDF |
How Potassium Hydroxide 50% works with gasket and O-ring materials.
| Material | Rating |
|---|---|
| Buna-N | |
| EPDM | |
| Viton® |
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