![]() What happens if I cut open a hand warmer? If you use them for a time period of less than that, put them in a plastic bag or something that you can seal them off from the oxygen in the air. They often have a useful life of around 5 hours. Hand warmers such as Hot Hands and Grabber work on a chemical reaction with oxygen. Mummy them up tightly in about 2 feet of plastic wrap until you can no longer feel the heat coming through. I discovered I can keep them until the next day and sometimes several days by wrapping them tightly in Saran wrap or other generic plastic wrap. Mummified hand warmers can be revived for another day. The exact expiration date is printed on the box. Our warmers have a shelf life of 3-4 years. How long do hand warmers last after expiration date? ![]() Some hand warmer varieties, like catalytic burner warmers, prove to be more dangerous than others. Some people, usually children, have very sensitive skin and should not let hand warmers come into direct contact with their skin. “They do produce heat, and heat with other flammable combustibles and flammable liquids is not a good mix, so just keep them away from things like that.” Are hand warmers good for you?Īre Hand Warmers Safe to Use? Most hand warmers are safe if used properly. “Of course you want to be careful and read the directions before you use them, but they are pretty safe,” Maples said. They will still work if unopened, just not as long. It just means that they work best if used by the date.
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