Why a TPU phone case is not transparent?

TPU (Thermoplastic Polyurethane) phone cases can actually be transparent or opaque, depending on their manufacturing process and the specific materials used. The transparency of a TPU case is influenced by several factors:

  1. Material Composition: Pure TPU can be made transparent. However, the addition of certain additives or colorants to enhance durability, flexibility, or to add color can affect its clarity, making it opaque or colored.
  2. Processing Techniques: The methods used to mold and finish TPU cases can impact their transparency. For instance, certain manufacturing processes can introduce textures or patterns to the surface of the case, which might diffuse light and reduce transparency.
  3. Thickness: The thicker the case, the more likely it is to appear less transparent. This is due to the way light passes through and is scattered by the material; thicker materials scatter light more, which can reduce clarity.
  4. Aging and Wear: Over time, TPU cases can become less transparent due to exposure to sunlight, oils from skin, and other environmental factors. UV exposure can cause yellowing, and physical wear can create scratches and scuffs, which scatter light and make the case appear cloudy or opaque.

In summary, while TPU is a material that can be made transparent, various factors ranging from the manufacturing process to environmental exposure can affect its clarity. Manufacturers might opt for slight opaqueness to hide wear and tear, add durability, or simply for aesthetic reasons.

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