Title of the project:
Bonding of polycarbonate (PC)
Bonding of polycarbonate (PC)
Project leader:
Dipl.-Ing. Sebastian Wagner
Project funding:
  • Bundesministerium für Wirtschaft und Energie
Project management:
  • Arbeitsgemeinschaft industrieller Forschungsvereinigungen Projekt GmbH
Funding reference number:

Polycarbonate (PC) is a plastic which, since its development in 1953, has become increasingly important in industrial production and everyday use. The impact strength, stiffness as well as the optical properties (transparency) distinguish PC. In contrast to acrylic glass (PMMA), however, there is no bonding process that enables a safe and optically high-quality connection between PC components. The aim is to develop a UV-curing adhesive and the associated manufacturing and testing process for joining PC components at butt edges and mitre cuts.


The aim of the project is to design the refractive index of the adhesive to be developed in such a way that an optically perfect bond can be achieved. The mechanical limits of the bond should correspond to those of the PC material. In order to achieve a higher adhesion and strength in the unaged state as well as after resistance testing, various surface pretreatment methods will be investigated. These include low pressure (LP) and atmospheric pressure plasma (AD), mechanical cleaning and activation by flame treatment. These methods are to be compared by measuring the surface tension using test inks.
The measurement results should give an indication of the wettability of the surfaces to be bonded. The strength tests of the bonded components are carried out with tensile shear tests according to DIN EN 1465 as well as with test devices specially developed for these test purposes. Within the framework of the test results, concrete statements are to be made about the influences of the pretreatment methods on the strength of the bonded joint.
At the end of the project, the results obtained will be transferred to real components at the project partner Schäfer GmbH and the manageability of the process developed will be checked with regard to application and curing of the adhesive system.

Project partners:
  • Schäfer Kunststofftechnik GmbH
  • Byla Gesellschaft für Kunststoffchemie mbH
  • Runkel