Transparency
Transparency refers to the property of a material to let light through so that objects behind it are recognisable. In plastic parts, transparency plays a decisive role, particularly in applications where optical clarity is required, such as displays, packaging or medical devices.
The transparency of a plastic component is mainly influenced by three factors:
- Polymer used: The chemical structure and composition of the polymer largely determine its light transmission. Some polymers such as polymethyl methacrylate (PMMA) or polycarbonate (PC) are inherently very transparent, while other polymers are less light-transmissive due to their molecular structure.
- Wall thickness: The thickness of the plastic part plays a decisive role. Thinner components let more light through than thicker ones, as with increasing thickness the light is scattered and absorbed more strongly. An optimum wall thickness is therefore crucial in order to achieve the desired transparency.
- Surface quality: The condition of the surface also influences transparency. Smooth, polished surfaces reflect and scatter less light compared with rough or uneven surfaces. High-quality processing and possible post-processing steps such as polishing can considerably improve transparency.
