WACKER silicone resins, because of their high heat resistance and electrical insulation, are particularly suitable for impregnating mineral fillers, such as those required for producing electrical heating elements. The water-repellent effect of SILRES^® silicone resins ensures that electrical heating elements remain trouble-free and operate reliably year on year. An ELASTOSIL^® silicone rubber hydrophobic barrier layer additionally prevents the penetration of moisture via the tube ends and thereby reliably protects the sensitive electrical components against short circuits and corrosion.