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  There is a big difference between real high-definition Aluminum and ordinary Sublimation Aluminum. Some companies say that their products are high-definition   Aluminum, but they are not. The coating of high-definition Aluminum is very thick, which can better absorb the ink and the printed image is extremely vivid. Its   surface is very clean, no small spots and dust. The surface coating has higher hardness, and will not be burned by heating for a long time with high
  temperature. It is mainly used for printing photos of people and landscapes. The coating of ordinary Sublimation Aluminum is much thinner and the printing
  color is much   lighter. The surface coating is not perfect as HD, each sheet will have defects, such as some small spots, dust, paint residue, micro holes, etc.,
  these problems   when making some darker images will be more obvious. If you want to increase the transfer rate by increasing the pressure or prolonging the
  transfer time, the   surface will be burned with marks, especially on the darker images. It is more suitable to print signs or ordinary photos.

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