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  • When exposed to oxygen, the iron in the pouch oxidizes and produces heat.
  • When iron oxidizes, it produces iron oxide — more commonly known as rust.
  • The salt acts as a catalyst, while the carbon helps disperse the heat.
  • The vermiculite is used as an insulator for the purpose of retaining heat.
  • All of these ingredients are enclosed in a polypropylene bag.
  • Polypropylene allows air to permeate the ingredients while holding in moisture.