Cold weather prerequisite products -- heat patch
Disposable heat patch comes in many shapes and sizes directed at a specific application. They create heat for a given amount of time and then you dispose of them. They are inexpensive and to most are worth every penny. How does heat patch work? Most disposable warmers work via a chemical reaction with air. Just as with a fire, they have to have air to operate. The ingredients to the reaction are iron, water, cellulose, vermiculite, activated carbon and salt. When the iron in the pouch is exposed to oxygen, it oxidizes. When iron oxidizes, it produces iron oxide, commonly referred to as rust. The reaction creates heat. The salt in the pouch acts as a catalyst for the reaction. Think of a piece of bare metal that gets exposed to saltwater. Carbon, also in the pouch helps disperse the heat, and the vermiculite is used as an insulator for the purpose of retaining the heat. The cellulose is added as filler. With most disposable heat packs, a polypropylene bag that allows air to perme...