Magnesium Chloride

 

Health, Toxicity and the Environment

RoadSaver is safe for use around plants and animals as well as being less harmful to road surfaces
and metals at recommended application rates. According to independent studies conducted by the US
Department of Agriculture, RoadSaver is the least harmful of common dust suppressants to vegetation
and groundwater. Non-irritating and safer to handle, RoadSaver will not cause burning or stinging
associated with alternative products. RoadSaver is free of toxic metals and substances and is used as
an ice control agent and fertilizer for crops such as turf and small grains.

Accoring to air pollution studies, nearly 34% of the particulate matter in the atmosphere originates from
fine suspended dusts particles from unpaved roads, making unpaved roads one of the major man-made
contributors of particulate emissions on a national basis.

 

Product Performance

Magnesium Chloride (MgCl2), Calcium Chloride (CaCl2) and Lignosulfonates are the dominant dust
control and road stabilizationn agents used in North America. Environmental factors such as temperature,
humidity level, precipitation, and especially soil / aggregate type / gradation, play key roles in determining
the success or failure of one agent versus another:

For example: The Transporationn Association of Canada (TAC), in its Guidelines for Cost-Effective Use
and Application of Dust Palliatives suggests that “calcium chloride loses its hygroscopicity (ability to absorb
moisture from the air) as relative humidity decreases. Calcium chloride should be used with caution if long
dry spells are anticipated or low humidity exists.” They found that “magnesium chloride, while also hygroscopic, remains so at much higher temperatures and lower relative humidity than calcium chloride and therefore may be more suitable to dry climates.” They also state that magnesium chloride is “less corrosive than calcium chloride.”

According to a Colorado State University Study on the “Relative Effectiveness of Road Dust Suppressants”, magnesium chloride outperformed calcium chloride and performed very well in terms of aggregate retention. There was an estimated total agregate loss of 1.0 ton / mile / year / vehicle from the RoadSaver treated test section, 1.5 tons / mile / year / vehicle from the calcium chloride treated test  section and 2.6 tons / mile / year / vehicle from the untreated teest section. This translates into a 59% reduction in total aggregate loss when unpaved roads were treated with RoadSaverTM.

 

Calcium Chloride Conversion / Equivalency

Magnesium chloride and calcium chloride solutions cannot beb compared at equivalent solution percentnages due to the fact the materials have different molecular weights. Comparing the weights of the two compounds shows that calcium chloride (111) weighs 17% more than magnesium chloride (95). Therefore, if you have identical percentages by weight of the two solutions, then there is 17% more magnesium chloride in solution by volume than calcium chloride. the table to the left shows equivalent solutions by weight between magnesium chloride and calcium chloride.