Designing properties for aesthetics and function

The metallization process of plastic parts is usually driven by the metallic appearance, in combination with protecting the parts from damage by external forces. Purely functional metallized plastic components are also increasingly common, e.g. in the automotive industry.

While plating on plastic primarily involves chromium surfaces, PVD coating can be used for a wide range of metal, metal alloy and non-metal surfaces on plastic. Adding to the environmental and health aspects, this make PVD useful for many applications where plating is not an alternative.

Pure PVD metallization, which is a totally dry and clean process, can be used for many functional and some decorative uses. The PVD metal layer itself is typically in the 0,1 micrometer range. To increase scratch resistance of the plastic surface, e.g. for interior and exterior automotive parts, the PVD metal is often combined with a transparent top-lacquer.

Unlike plating on plastic, the surface structure of a molded plastic part is not altered by PVD metallization. This is because the vacuum-metallized coating is much thinner than the plated coating. By designing molding tools with glossy or matt surfaces, or combinations of different textures, the surface structure of the final metallized product will follow the mold design.

PVD metallization also allows light semi-transparent surfaces, for instance for back-lit features, commonly used in decorative trim in the automotive applications, and radar-transparent metal finishes, used for vehicle radar safety systems.