Sealing dielectric filling member with mechanically reinforced element

A radar level gauge, for determining a process variable of a product in a tank using electromagnetic measuring signals, comprising:

• a signal propagation device adapted to direct a microwave transmit signal toward said product and return reflections thereof from a surface of said product;
• a dielectric filling member arranged in said signal propagation device to prevent entry of tank content into the signal propagation device;
• and
• a sealing arrangement for preventing tank content from escaping into the outside environment;
• said dielectric filling member including:
• a main body formed of a polymer material, and
• at least one structurally reinforced element formed of a modified polymer material providing, said modified polymer material being obtained by modifying said polymer material with a filler material,
• wherein said at least one structurally reinforced element is integrally formed with said main body by sintering, and forms part of said sealing arrangement.