Not Medical Advice: Walgreens did not publish the contents of their Instant Cold Packs. What we found is that, a plastic cold pack is comprised of a water bag and a coolant consisting of ammonium nitrate, sodium carboxyl methyl cellulose, and sodium chloride.
As per Livestrong.com, ammonium nitrate has traditionally been the most common chemical used in instant cold packs. This chemical is kept separate from the water inside the pack until the seal is broken -- which is accomplished by bending or squeezing.
But please note that ammonium nitrate can be harmful to the body if it leaks from the cold pack and is swallowed, inhaled or comes in contact with the skin. In certain situations, ammonium nitrate is capable of exploding, and incurs additional shipping costs because it is considered a hazardous material.
There are many types of ice packs that can be used to reduce inflammation, swelling, and pain from arthritis. Here are some types of cold packs and select which works best for you based on personal preference, budget, and convenience shared by Arthritis-health.com.