Cork stone (building material)
Korkstein is from Cork , clays and quicklime produced building materials , from the early 20th century, for example, easy separation walls, weight, unloaded vault or suspended ceilings were produced. The material was also used for cold or heat insulation for floors , basement walls, window parapets or ice cellars . It was also used in building waterproofing to protect against moisture. The building material was invented and patented by Grünzweig & Hartmann in Ludwigshafen in the 1880s .
Manufacture and properties
Cork stone was mixed together from a mixture of bean or pea-sized cork waste, clay and air lime, then pressed into molds and finally dried at a temperature of around 120–150 °. The material produced in this way is very porous , has a specific weight of 0.8, is almost non-combustible and has only a low thermal conductivity .
Cork isolate
Similar to cork stone, cork isolate was also produced from cork and clay. For thermal insulation, however, cork isolate was also used in the construction of tropical houses , for cladding iron structures, steam boilers , steam pipes and other heat-radiating or heat-conducting objects.
Literature (selection)
- Robert Scherer: Coverings to protect against heat, cold, moisture and other influences , in this: The artificial floor, wall and ceiling coverings , reprint of the original edition based on the copy of the Leipzig University Library , Leipzig: Reprint-Verlag-Leipzig, Holzminden: [ O. D., 1922], ISBN 3-8262-1921-X , p. 153 et al .; Preview over google books
Web links
- Result of the keyword search Korkstein in the catalog of the German National Library
- P. Schwoch (contact person): Korkstein - tar cork / the typical insulation of large cold stores until around 1960 on the website norddeutsche-eiswerke.de for the purpose of preserving the historic ice cream factory (Berlin-Mitte)
Individual evidence
- ^ A b c Korkstein in: Meyers Großes Konversations-Lexikon , Volume 11, Leipzig 1907, p. 500; online via Zeno.org
- ^ Meyers Konversations-Lexikon , 1888; Verlag des Bibliographisches Institut, Leipzig and Vienna, fourth edition (1885–1892), Volume 18: Annual Supplement 1890–1891, page 497; online at elexikon.ch from Peter Hug