This is a specialized semi-trailer for transporting refrigerated liquid ethylene, a highly volatile cryogenic flammable gas. Its standout advantage is the vacuum-powder insulated double-layer tank, which rigorously minimizes heat ingress to maintain stable ultra-low temperatures, ensuring cargo integrity. Safety features of this cryogenic semi trailer include an EBS for responsive braking control and optional air suspension that effectively absorbs road shocks, significantly enhancing stability for this hazardous load.