(FR2778020-A1)   NOVELTY - A prefabricated body of the plastic (3) and the component (1) surface being passivated (2) are brought together. Exertion of pressure assembles them permanently.    USE - To passivate for example electronic actuating components, protecting them from contamination and mechanical damage, whilst also insulating them. A specific claim is made for an actuator produced, which is used with a fuel injection valve. The component may be a fuel cell (claimed use).    ADVANTAGE - When a piezoelectric component is used to control a fuel injection valve, the need to resist a range of temperatures (-50degreesC to + 150degreesC) dictates use of a silicone-based rubber, of which the precursor is particularly viscous in the non-crosslinked state. This makes passivation by coating or injecting a thin layer, particularly difficult. Further difficulties accrue. The new method is simply applied, overcoming the problem by prefabricating the passivating rubber, which is readily possible, using highly viscous material. The body used, may be non- or only partly vulcanized. This has the advantage, that during crosslinking, it flows into all recesses, completing an intimate covering.    (FR2785142-A1)   NOVELTY - A prefabricated body of the plastic (3) and the component (1) surface being passivated (2) are brought together. Exertion of pressure assembles them permanently.    USE - To passivate for example electronic actuating components, protecting them from contamination and mechanical damage, whilst also insulating them. A specific claim is made for an actuator produced, which is used with a fuel injection valve. The component may be a fuel cell (claimed use).    ADVANTAGE - When a piezoelectric component is used to control a fuel injection valve, the need to resist a range of temperatures (-50degreesC to + 150degreesC) dictates use of a silicone-based rubber, of which the precursor is particularly viscous in the non-crosslinked state. This makes passivation by coating or injecting a thin layer, particularly difficult. Further difficulties accrue. The new method is simply applied, overcoming the problem by prefabricating the passivating rubber, which is readily possible, using highly viscous material. The body used, may be non- or only partly vulcanized. This has the advantage, that during crosslinking, it flows into all recesses, completing an intimate covering.