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Rabbit420 · 70-79, M
Actually it starts losing effectiveness below 20 F.......
Rock salt (sodium chloride) loses significant effectiveness as temperatures drop below 20°F (-6°C), becoming much less efficient and practically useless below 15°F (-9°C), at which point it struggles to create the brine needed to melt ice, requiring much more salt or alternative deicers like calcium chloride. While its eutectic point (technical limit) is around -6°F, its practical application diminishes drastically in extreme cold, making it ineffective and potentially just creating slippery slush.
Rock salt (sodium chloride) loses significant effectiveness as temperatures drop below 20°F (-6°C), becoming much less efficient and practically useless below 15°F (-9°C), at which point it struggles to create the brine needed to melt ice, requiring much more salt or alternative deicers like calcium chloride. While its eutectic point (technical limit) is around -6°F, its practical application diminishes drastically in extreme cold, making it ineffective and potentially just creating slippery slush.



