14 Dec Choosing The Right Deicing Product
The types of deicing products and their uses are many and varied. While many may think that deicing is as simple as throwing down salt in cold temperatures and expecting it to clear up all of the ice, this is not the case. There are many factors that can affect how well a deicer does its job and dictate when and where a certain product should be used.
Some of the factors include but are not limited to:
- Surface type
Surface Type for Deicing Material
More often than not you will be treating a concrete or asphalt driveway/sidewalk. When applying any chloride based deicing product (rock salt is sodium-chloride) to a concrete surface there will be some kind of corrosion. The amount of damage caused by the repeated use of deicing can be controlled by using a gentler deicing product. For example Calcium Magnesium acetate (used at airports & parking garages). You can also apply the deicer following some simple steps that may reduce the amount of deicer used and so the amount that comes in contact with the surface you are trying to protect. These steps are
- Remove any loose snow or ice first
- Apply the deicer as uniformly and sparingly as is beneficial (ideally using a spreader)
- Once applied spead any over covered areas out with a broom.
- If you have a chance during the melting process try and break up any ice that becomes loose.
Another surface that can have problems if the wrong deicing product is used is decking or any wooden surface. If for example any chloride based product is applied it can create 2 potential hazards. The first being that the chloride will begin to corrode the fastening system holding the deck together. The second being that the brine will attract moisture in the pores of the wood and this will allow the water to refreeze as black ice.
There can also be collateral damage to areas around the treated surface due to run off of the brine solution. A Lawn that runs along the edge of a driveway or plants that are next to a doorway can suffer when the soil they are planted in becomes saturated with the run off brine solution.
Water will diffuse from the plant to the area of high salt concentration. This is because water will always move from an area of high concentration to an area of low concentration (osmosis). So the plant will have the high water concentration and the ‘salty area’ will have a low water concentration. Once the water has diffused to the lower concentration outside of the plant, the plant is left dehydrated.
Temperature Of Snow And Ice
Another factor that can change the deicing product that you select is the temperature. Not all deicing products are the same when it comes to their peak operating temperature. For example rock salt (sodium chloride) will be effective to around 20F then the reaction with the ice begins to slow down as the temperature drops. So if it is an absolute must that you have your driveway/parking lot clear of ice completely in temperatures as low as -20F, rock salt is not the deicing product for you. This is where Calcium Chloride comes in and would be the product for you. It has an effective melting range all the way down to -25F and a very fast reaction time, relative to other deicing chemicals. There are many products that fill in the temperature range that may be better suited to your needs, as there is a correlation between the effectiveness of a deicing product and its price.
Cost of Deicing Material
As mentioned above the price of deicing products usually depends on the effectiveness of the product in different conditions and temperatures. Deicing products are a very important item to have on hand as we all know a winter storm can sneak up on us at any time. So holding enough on hand can be crucial but this also needs to be balanced with not holding too much inventory as that can lead to a surplus of product at the end of the season if there is only a light winter. This then is an expense that could have been avoided or at the least mitigated. For example if you simply cannot have a time where you run out of deicing product but need to keep inventory value lower, a lower cost (possibly slightly less effective) higher volume product may be for you. Whereas if you are only concerned about those times when temperatures reach an extreme then a higher cost but lower volume may be the choice for you. It is a balancing act when it comes to avoiding wastage at the end of a season.
So as you can see snow and ice control is a balancing act. You are balancing performance, which is generally defined as a black and wet surface, against adverse consequences, which encompasses everything from cost, to the right chemistry for your environment and collateral impact.