In mid-class cars 1,700 of a total of 5,000 individual parts are made of plastic. In particular, the combination of the outstanding properties with corrosion resistance, processability and the availability of well-established mass production techniques such as extrusion, injection molding and blow molding contribute to the continued success of plastic. X-ray, ultrasound, thermography and microwaves have hitherto been used for non-destructive testing of plastics. All these methods have their own advantages and disadvantages. A new powerful measuring technique is the terahertz measuring technology, which uses electromagnetic waves and thus operates without contact.

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