The main chemical element of the cooling crystal is sodium sulfate decahydrate (Na2SO4 • 10H2O), is Glauber's salt (or Minggelaobai salt. Sodium sulfate decahydrate crystals be containing 55.9% water, 44.1% sodium sulfate) sodium sulfate is monoclinic, often grainy, blocky, or hull shape, is a colorless and transparent material.it may lose crystal water at 100 ℃. Usually sodium sulfate decahydrate will gradually lose its moisture in dry air, thus transformed into a white powder of anhydrous Glauber's salt, anhydrous Glauber's salt soluble in water, with moisture absorption. We integration and improvement to be the gel-like crystals through this technology, when the temperature up to 42 degrees ,the heat of the liquid will be conducted to surrounding