Leitungsrohr fuer Heizungsanlagen und Wasserinstallationen,insbesondere Warmwasserleitungen

摘要

A method of making an insulated tube. A steel tube is internally clad with corrosion-resistant material and externally jacketed with foamed plastic material having a volumetric weight which at most approaches 0.7 p/cm3. The resulting product is corrosion-resistant as well as thermally insulated and sound insulated.