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Our HeatMax® family of air activated warmers all contain a mixture of natural ingredients that when exposed to air react together to produce heat. This is accomplished through an extremely fast oxidation (or rusting) process. Ingredients include: iron powder, water, salt, activated charcoal and vermiculite. HeatMax® has perfected the process so that our warmers, depending on the individual product, produce heat anywhere from 100°F to 180°F for duration of 1 to 20+ hours.
seal the hole in the dry suit place the thing inside throw it in water and if it explodes dont do it
I'm not sure exactly what would happen if you tried using these things in a dry suit under pressure but I'm sure of one thing. The reaction will depend on the partial pressure of oxygen and if you raise that you will raise the reaction rate.