The vanes are stacked on a sturdy plastic base. The dielectric product consists of a polypropylene film which ensures good vane stability and prevents microphony. The capacitor can be adjusted at the top with a screwdriver. Flux absorption between the vanes is eliminated. The trimmers resist all standard cleaning solvents with the exception of trichlorethylene and trichloroethane. Climatic category (IEC68 40/070/21). Basic specification (IEC481-1 and 4).