LM-XL-21 cold-storage PCM can store and release heat through the change of material phase state. As a professional phase change cold storage agent, it has high energy storage density and appropriate specific heat and thermal conductivity, safe and reliable, and is non-dangerous goods, not easy to deteriorate, not volatile, can be used repeatedly, efficient and environmental protection. It has a wide application prospect in the fields of food freezing transportation, cold storage, refrigerator energy saving, low temperature air conditioning and so on.