Abstract: The use of ohmic heating technology in soft thermal storage hand warmers has always been controversial. This product market proportion is big, and has a high unqualified rate in common sampling inspection, this situation has already affected the development of the industry. Our research is based on validation tests with new and used samples, we find that the hand warmers are electrical safe when using ohmic heating technology, the corrosion of the electrode has a positively relationship to the used times, they have a stable erosion process. The average first failure time meets the expected use, we adopt questionnaires method to get the required data and replace the old with the new from the users, it can be seen that the ohmic heating technology used for hand warmers has certain applicability.

Key words: Ohmic heating, Soft hand warmer, Applicability, Stability