Unlike refrigerators that require the use of electricity to generate cold air and maintain low temperatures, a cooler is a passive heat insulation barrier that achieves its insulation effect by slowing down the transfer of external heat to the interior. It accomplishes this through the following three scientific principles:

  • Utilizing poor heat conductors to block heat transfer: Thick polyurethane (PU) foam is filled in the core of the cooler. Millions of tiny bubbles in this foam form a “heat barrier zone”.
  • Reflecting heat radiation: The outer shell is usually made of low-density polyethylene and is treated with UV protection on the surface, which can reflect solar radiation, preventing the surface of the cooler from heating up when exposed to sunlight.
  • Sealing: The inner part of the lid uses silicone rubber gaskets. By creating a sealing effect, this design prevents “convection” between the hot air outside the box and the cold air inside the box.