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Shelf life of caustic soda (liquid and flakes)

Shelf life of caustic soda (liquid and flakes)

by hossien moshiri
caustic soda expiry date

Storage matters

Liquid NaOH

In its liquid form, caustic soda is highly soluble in water, making it prone to dilution or evaporation. To prevent this, it is recommended to store the liquid caustic soda in a sealed container with minimal headspace, reducing air and water contact. Properly stored liquid caustic soda can have a shelf life of about 12 to 18 months.

Flakes NaOH

Flake caustic soda, on the other hand, has a longer shelf life due to its solid form. The flakes are less prone to degradation or dilution. If stored correctly in a dry, airtight container, flake caustic soda can maintain its quality for up to 2 to 3 years. However, it is important to note that over time, the flakes may become harder and more difficult to dissolve, requiring extra precautions during usage.

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Another crucial factor affecting the expiry date is its purity. High-quality caustic soda with minimal impurities has a longer shelf life compared to impure forms. Poorly stored or old caustic soda can start to decompose, resulting in a decrease in purity. It is best to check the expiration or manufacturing date on the product label to ensure the caustic soda is still within its recommended shelf life.

Packaging quality

Furthermore, the packaging of caustic soda plays a significant role in maintaining its shelf life. Manufacturers typically use robust containers made from materials that are resistant to caustic soda, such as stainless steel, polyethylene, or PVC. These containers protect the caustic soda from external factors like temperature changes, moisture, and light exposure, extending its shelf life.

Regular inspection

It is important to regularly inspect the stored caustic soda to ensure its quality and viability. Any signs of degradation, such as discoloration, clumping, or changes in odor, indicate that the caustic soda may have surpassed its shelf life. In such cases, it is recommended to dispose of the caustic soda safely and acquire a fresh supply to maintain high-quality results in industrial processes.


In conclusion, the expiry date of NaOh, whether in liquid or flake form, depends on various factors such as storage conditions, purity, and packaging. For optimal longevity, caustic soda should be stored in cool, dry places away from direct sunlight, in airtight containers resistant to caustic substances. Liquid sodium hydroxide typically has a shelf life of 12 to 18 months, while flake caustic soda can maintain its quality for 2 to 3 years if stored properly. Regular inspections of the stored caustic soda are crucial to ensure its viability and effectiveness in industrial applications.

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