The surface energy of most plastic materials is low so that they are wetted unsufficiantly by glues, lacquers and coating dyes. Therefore these plastics cannot be painted or glued by conventional methods. A solution has been found by applying chemical primers which are able to provide functional chemical groups on the plastic surface. However many of the most efficient primers have been prohibited because of their aggressive and hazardous efects.
Activation in an Oxygene low pressure plasma has the same or better effect than the most efficient primers without endangering the enviroment by hazardous effects.