It can be kept for 5 years. The words on thermal paper can be stored for 5 years, and some can even be stored for 10 years. However, if the hot coating formula is unreasonable, part of it will gradually disappear within ten days. Thermal paper: Thermal paper is also called thermal paper. Thermal paper is a kind of processed paper, and its manufacturing principle is to coat a layer of "thermal paint" (thermochromic layer) on high-quality base paper. Thermal paper is used as the communication carrier of words and graphics on fax machines. Used as recording materials in medical and measurement systems, such as ECG paper and thermal instrument recording paper. Internet terminal printing paper. In commercial activities, it is used to make trademarks, identification codes (POS), etc., in which the amount of fax paper accounts for the largest proportion.