Winter 2017-18

20 Deicer Effective* Temperature ºF / ºC 1 Potential Freeze Thaw Degradation of Concrete Additional Potential of Chemical Degradation of Concrete Comments NaCl Sodium Chloride 15 / -9 Least Among Deicing Salts Minimal Least damaging deicer; use whenever possible. CaCl 2 Calcium Chloride -2 / -19 Minimal to Moderate Moderate Use judicially if a more effective, quicker acting deicer is needed. CMA Calcium Magnesium Acetate 19 / -7 Moderate Moderate to Significant Not recommended. Potential for damage increases with the amount of magnesium in the formulation. MgCl 2 Magnesium Chloride -8 / -22 Moderate to Significant Significant Not recommended. Highest potential for damage. *Effective temperature is lowest practical temperature of the deicer defined as the lowest temperature at which the relative melting potential (MP) is 0.7 as calculated in reference 1 below. 1 Information adapted from National Cooperative Highway Research Program Report 577 “Guidelines for the Selection of Snow and Ice Control Materials to Mitigate Environmental Impacts” ©2007 Transportation Research Board.