What is the Difference Between Rock Salt and Calcium Chloride?

The main differences between rock salt and calcium chloride are their effectiveness in different temperature conditions, environmental impact, and corrosive properties. Here is a comparison of the two:

Rock Salt (Sodium Chloride):

• Effective in temperatures down to 15 degrees Fahrenheit.
• Nearly 100% Sodium Chloride.
• Less expensive than calcium chloride.
• Damaging to soil, vegetation, and concrete.
• Can be harmful to pets.
• Melts ice by sitting on its surface and dissolving.

Calcium Chloride:

• Effective in temperatures as low as -25 degrees Fahrenheit.
• Concentrates its dissolving action on a specific area, making it more efficient at breaking up ice.
• More expensive than rock salt.
• Less damaging to the environment, including lawns, plants, and vegetation.
• Corrosive, but not as likely to be over-applied due to its higher cost.
• Less eutectic point, meaning it melts at much lower temperatures than salt.

In summary, calcium chloride is more effective in colder temperatures and has a less negative impact on the environment and surfaces, but it is also more expensive than rock salt. Rock salt is more affordable but loses its effectiveness in colder temperatures and can cause damage to soil, vegetation, and concrete.

Comparative Table: Rock Salt vs Calcium Chloride

Here is a table comparing the differences between rock salt and calcium chloride:

Both rock salt and calcium chloride are used as de-icing agents, but they have different chemical compositions, effectiveness at various temperatures, and environmental impacts. Calcium chloride is more effective at lower temperatures and melts ice faster than rock salt, making it a more powerful de-icing agent in certain situations. However, it is more expensive than rock salt and can still cause corrosion and damage to vegetation.