Borated high density polyethylene Shielding Plates | China Jinping Underground Laboratory Project

China Jinping Underground Laboratory, the largest dark matter detection laboratory in China, is buried 2,400 meters deep inside a mountain. Our boron-loaded ultra-high molecular weight polyethylene (UHMWPE) plates are adopted for its polyethylene shielding cabin, serving to shield neutrons and block radiation.

The polyethylene shielding cabin is constructed with 1,800 tons of high-density polyethylene plates. Dark matter is extremely difficult to detect. Direct detection can only be achieved deep underground, where interference from various cosmic rays must be eliminated.

High-density polyethylene (HDPE) plates inherently possess radiation shielding properties. During the manufacturing of polyethylene plates, boron carbide ranging from 2% to 50% can be incorporated into the material according to the radiation intensity of the application field. This effectively blocks penetration and leakage of radioactive radiation sources, delivering safer and more comprehensive protection for nearby personnel. It is a new type of rigid shielding material developed by the China Academy of Engineering Physics.

Our boron-containing  high density polyethylene shielding plates were successfully deployed in the China Jinping Underground Laboratory, China’s largest dark matter detection facility. The polyethylene shielding cabin, assembled with 1,800 tons of HDPE boards, effectively blocks neutron radiation and suppresses cosmic ray interference, creating an ultra-low-background environment for dark matter detection. The material delivers stable radiation shielding performance. By adjusting the boron carbide additive ratio from 2% to 50%, customized shielding solutions are available to meet diverse radiation intensity requirements across nuclear and deep underground research projects

he supplied polyethylene shielding panels meet strict nuclear industry standards with consistent dimensional accuracy and reliable shielding capability. The full-process quality control system ensures stable material performance for long-term underground operation. Our client highly recognizes our technical strength, customized material formulation capability and on-time delivery, and has established long-term cooperative relations with us.