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While I haven't found an actual study about the degradation of CMC, Food Grade CMC is usually regarded with a shelf life of 2 years while dry.

If your CMC is already dissolved in water it may only last a few days before algae form.

CMC won't fermentate, so, unless it gets wet, if there's no trace of algae in the top it's not spoiled but may have a reduced performance after 2 years in storage for food grades and 4 years for industrial grades.

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10y ago
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Q: Does cmc powder have a shelf life does it expire?
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