Generally, cryopreservation tubes cannot enter liquid nitrogen, only those treated with special materials can be placed inside. At the same time, there are various types of cryopreservation tubes, including double-layer and non double-layer ones with silicone pads and without silicone pads, as well as colorless, variegated, and various solid colors. If you need to enter liquid nitrogen storage, you need to choose a sealed low-temperature resistant specialized cryopreservation tube. You also need to recognize whether the purchased cryopreservation tube is sterile and has no DNA/RNA. It is made of transparent polymer material polypropylene and manufactured through special processes to withstand ultra-low temperatures, And ensure no leakage, the tube body can have clear and precise markings and handwritten blank labels, making it convenient for recording. If necessary, use long-term low tear refrigeration with stem cells and tissues.