Calcium Chloride Versus Magnesium Chloride in Ice Melter Products

Calcium Chloride Versus Magnesium Chloride: Choosing the Superior Ice Melter

When it comes to ice melter products, the choice between calcium chloride (CaCl2) and magnesium chloride (MgCl2) significantly impacts effectiveness and performance. This article delves into a comparative analysis of these two chlorides to assist users in making informed decisions for their winter maintenance needs.

Freeze Points and Eutectic Temperatures

Understanding the freeze points and eutectic temperatures is crucial in evaluating the effectiveness of these chlorides. Calcium chloride’s eutectic temperature stands impressively low at -60˚F (-51˚C), providing exceptional cold resistance. On the other hand, magnesium chloride’s eutectic temperature is -28˚F (-33˚C). However, the melting rate of magnesium chloride drops significantly before reaching this temperature, leading to crystallization.

Challenges with Magnesium Chloride: Crystallization and Impurities

A common challenge associated with magnesium chloride is the presence of magnesium sulfate as an impurity. This impurity crystallizes within a range of -18˚C (0˚F) to -20.5˚C (5˚F), causing issues such as sludge formation in tanks, clogging of spray nozzles, and complications with transfer pumps. In contrast, a 32% calcium chloride solution, the standard concentration in winter, remains crystal-free within its working range.

Ice Melting and Penetration: Calcium Chloride’s Superiority

Calcium chloride outshines magnesium chloride in terms of ice melting capacity and penetration. In a Midwest Research Institute study, conducted based on FHWA and Strategic Highway Research Board test methods, it was found that at -7˚C ( 20˚F), calcium chloride exhibits 22% more penetration after 10 minutes and 38% after 30 minutes compared to magnesium chloride. At -15˚C (5˚F), calcium chloride penetrates 58% more ice after 30 minutes.

Application Rate and Environmental Impact

Calcium chloride’s higher ice melting capacity and faster penetration translate to a lower application rate compared to magnesium chloride. When applied as liquids, two parts of calcium chloride perform more efficiently in less time than three parts of magnesium chloride. Additionally, environmental considerations play a role, with studies indicating that calcium chloride is less toxic than magnesium chloride in bioassay tests on aquatic organisms like rainbow trout and water fleas.

Scrub n Shine’s Solution

For those seeking a high-quality solution, Scrub n Shine offers a perfectly blended mix of four chlorides. This blend ensures optimum effectiveness while minimizing environmental impact. Feel free to contact us to learn more about our premium ice melter product and make an informed choice for your winter maintenance needs.