Winter brings with it the challenge of managing snow and ice, particularly on driveways, sidewalks, and roads. The most commonly used chemicals for melting ice are magnesium chloride and calcium chloride, each with unique properties and benefits. In this article, we’ll compare magnesium chloride vs calcium chloride to help you choose the best solution for your needs.
Whether you’re a homeowner, contractor, or municipality, understanding the performance, cost, and environmental impact of these chemicals is essential for effective ice management and identifying the most effective ice melter. At Old Station Outdoor & Landscape Supply, we offer expert advice on choosing the right solutions for your needs. Let’s dive into how each one works, their advantages, and when you should use them.
Introduction to Ice Melts
Ice melts are essential chemical substances used to manage ice and snow during freezing temperatures, helping to keep concrete surfaces, sidewalks, and roads safe and accessible. Among the most popular deicing chloride salts are calcium chloride and magnesium chloride, both known for their substantial ice-melting ability. Calcium chloride ice melt is especially valued for its performance in extremely cold temperatures. This makes it a go-to solution for areas that experience harsh winter conditions. When choosing an ice melt, it’s important to consider factors such as melting temperature, how deeply the product can penetrate and break up ice, and the overall impact on ice control. By understanding these elements, you can select the most effective product to melt ice and maintain safe surfaces throughout the winter.
What are Magnesium Chloride and Calcium Chloride?
Before we look at how they perform and where they are used, it helps to understand what magnesium chloride and calcium chloride are. While both are common ice-melting compounds, they differ in composition, strength, and how they interact with surfaces and the environment.
Magnesium Chloride
Magnesium chloride (MgCl2) is a chemical compound derived from natural sources, primarily seawater. It is highly hygroscopic, meaning it attracts moisture from the air, which helps it melt ice more effectively at higher temperatures. Magnesium chloride works best at moderate winter temperatures, typically above -13°F (-25°C), and is less corrosive than other deicing agents.
Calcium Chloride
Calcium chloride (CaCl2), on the other hand, is another effective deicer commonly used in colder climates. Its active chemical purity contributes to superior ice melting performance, allowing for faster penetration and reduced application rates. It has a lower melting point compared to magnesium chloride, working well in extremely cold temperatures as low as -25°F (-32°C). Like magnesium chloride, calcium chloride also draws moisture, but it can be more aggressive on surfaces like concrete and metal.
These two salts have a common goal: to melt ice efficiently. However, they differ in their chemical composition, cost, and environmental impact.
How Do Magnesium Chloride and Calcium Chloride Perform in Cold Weather?
Both magnesium chloride and calcium chloride are designed to melt ice, but their performance can vary based on temperature, application conditions, and the typical concentration used. These factors can influence both their effectiveness and cost-efficiency.
Magnesium Chloride Ice Melt
Magnesium chloride is effective at temperatures as low as -13°F (-25°C). Its ability to attract moisture from the air enables it to melt ice in moderate winter conditions. However, impurities such as magnesium sulphate crystallizes when temperatures drop, which may clog equipment and reduce efficiency. It is often preferred in areas where winters are mild to moderate because of its faster melting rate compared to calcium chloride in those conditions.
Calcium Chloride Ice Melt
Calcium chloride performs exceptionally well in extremely cold temperatures, making it the better choice for places with harsh winters. It can melt ice at temperatures as low as -25°F (-32°C), which is ideal for areas with severe winter weather. Calcium chloride products are available in various forms, including flakes and pellets, to suit different application needs. Flake calcium chloride deicers are commonly used for their safety and efficiency. This makes them a preferred option for both residential and commercial ice management. Calcium chloride works more slowly than magnesium chloride in milder temperatures, but in extreme cold, it excels by breaking down ice and snow effectively.
Performance Comparison Table:
| Chemical | Effective Temperature Range | Melting Speed | Best Use |
|---|---|---|---|
| Magnesium Chloride | -13°F (-25°C) | Faster in moderate temps | Residential, mild winters |
| Calcium Chloride | -25°F (-32°C) | Slower in mild temps | Commercial, severe winters |
Both magnesium chloride and calcium chloride are widely used ice melters. However, magnesium chloride is considered a more destructive salt, while calcium chloride can be a less effective ice melter due to its application conditions.
Environmental Impact: Which Is Safer for Your Property and the Planet?
One of the major concerns with using deicing salts is their environmental impact. Both magnesium chloride and calcium chloride are widely used as industrial materials for deicing, but their environmental impacts differ.
Magnesium Chloride’s Environmental Impact
Magnesium chloride is generally considered eco-friendlier than other salts because it has a lower toxicity to plants and animals. However, it is often regarded as the most destructive salt for concrete and metal highway components, especially mild steel, due to its high corrosiveness. This can lead to significant deterioration of infrastructure over time. While magnesium chloride is sometimes described as less corrosive in certain contexts, choosing alternative deicers like calcium chloride can help reduce corrosion and extend the lifespan of metal highway components and other infrastructure. Additionally, magnesium chloride’s hygroscopic nature allows it to work effectively without needing as much product.
Calcium Chloride’s Environmental Impact
While calcium chloride is effective in melting ice at lower temperatures, it has some environmental drawbacks. It can cause soil erosion, plant damage, and concrete deterioration if over-applied. However, compared to magnesium chloride, calcium chloride is less damaging to concrete reinforcements and metal rebar, helping to maintain durable concrete structures over time. It is also highly effective at melting ice in harsh conditions. This makes it a preferred choice for commercial or municipal use in urban settings where environmental concerns may take a backseat to performance.
Storage and Handling of Ice Melts
Proper storage and handling of ice melts like calcium chloride and magnesium chloride are key to preserving their effectiveness and ensuring safety. Both calcium chloride and magnesium chloride products should be kept in a cool, dry location, away from any sources of moisture or direct sunlight. Exposure to humidity can cause these products to form crystals or clump together, reducing their ability to melt ice efficiently. Always store ice melts in their original, sealed packaging and follow the manufacturer’s guidelines for handling. When working with these chemicals, it’s wise to wear gloves and avoid direct skin contact, as they can be irritating. By taking these precautions, you’ll ensure your ice melt remains potent and ready to tackle winter’s challenges.
Application Methods for Ice Melting
There are several effective ways to apply ice melt products, and the best method often depends on the type of ice melt, the surface you’re treating, and the current weather conditions. Calcium chloride ice melt can be spread evenly using a broadcast spreader or applied as a liquid with a sprayer, while magnesium chloride ice melts may be used in similar or specialized application systems, unlike rock salt, which has a different application method. Pre-wetting the surface or the ice melt itself can help the product adhere better and start working faster. Regardless of the method, always follow the manufacturer’s instructions and use appropriate safety gear, such as gloves and protective eyewear, to avoid irritation. Choosing the right application technique ensures that your ice melt works efficiently and safely, providing reliable ice control throughout the season.
Cost Comparison: Which Is More Cost-Effective?
When deciding between magnesium chloride vs calcium chloride, the cost of these products is another crucial factor to consider. Although both are relatively affordable, their price per application can vary depending on the size of the area being treated.
Magnesium Chloride Cost
Magnesium chloride tends to be more expensive per unit than calcium chloride. However, due to its faster melting capabilities, it can be more cost-effective in milder climates where less product is required to manage moderate ice conditions.
Calcium Chloride Cost
While calcium chloride is generally cheaper per pound than magnesium chloride, it may require larger quantities for extreme conditions. If you’re dealing with heavy snowfall or extremely cold temperatures, calcium chloride may end up being the more economical choice in the long run, despite its higher initial cost.
Other Uses for Magnesium Chloride and Calcium Chloride
While magnesium chloride and calcium chloride are primarily used for deicing, both compounds have other applications that may influence your decision on the best ice melt.
Magnesium Chloride
In addition to being an effective ice melt, magnesium chloride is also used as a desiccant in moisture control. It is commonly employed in industrial applications to absorb moisture in storage facilities, warehouses, and packaging environments. Magnesium chloride is also beneficial in dust control for construction sites.
Calcium Chloride
Calcium chloride is widely used in dust control on unpaved roads and construction sites due to its ability to absorb moisture and bind dust particles. Additionally, calcium chloride is commonly used in concrete production as it accelerates the curing process and helps maintain moisture levels in large-scale industrial projects.
Conclusion
In the battle of magnesium chloride vs calcium chloride, both have their strengths and ideal use cases. Magnesium chloride is better suited for moderate conditions and areas where environmental concerns are a priority. On the other hand, calcium chloride excels in extreme cold and commercial applications where performance is the primary concern over environmental impact. Choose the right product based on your specific needs, whether it’s for home use or large-scale operations.
At Old Station Outdoor & Landscape Supply, we offer expert guidance to help you choose the best ice melt for your needs. Whether you’re tackling a residential driveway or managing a large commercial property, we can provide tailored advice and solutions. Contact us today to get started on effective ice management for your property.
FAQs
Which one is better, magnesium or calcium?
Neither is universally better. Magnesium chloride is ideal for moderate winter conditions and areas where environmental impact matters, while calcium chloride performs better in extreme cold and high-traffic or commercial settings.
What are calcium chloride and magnesium chloride?
Calcium chloride and magnesium chloride are chemical ice melt products used to lower the freezing point of water and break ice on roads, driveways, and sidewalks. Calcium chloride works at much lower temperatures, while magnesium chloride is typically less corrosive.
Why is magnesium chloride more environmentally friendly than calcium chloride?
Magnesium chloride is generally less harmful to vegetation, soil, and waterways and is less corrosive to concrete and metal. It also tends to be used in smaller amounts, reducing overall environmental impact.
What is the safest salt to use on concrete?
Magnesium chloride is considered one of the safest options for concrete because it causes less surface damage and scaling compared to traditional rock salt or calcium chloride, especially when used as directed.
