Why is the LN2 Cryo-box Recommended PC Material Instead of PP Material?

Cryo-boxes are mainly used in liquid/vapor phase liquid nitrogen storage environments. The common cryo-boxes are generally made of PP(polypropylene) or PC(polycarbonate).

Compared with PC material, PP material has better flexibility and ductility and lower cost, but PP material may cause problems in following situations,

1. Because PP material is softer, the box body is easily deformed by external forces, and the lid cannot be opened or closed after ultra-low temperature storage.

2. PP material will become brittle when stored for a long time in cryogenic environment, resulting in fragility. Especially when it is used in the ultra-low temperature automation equipment, the cryo-box is easy to break and even fall in the equipment due to the external force of the mechanical arm when grabbing.

PC material is harder and cold resistant, which is more suitable for making cryo-boxes. (This article above is from network)