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POLYURETHANE VERSUS POLYSTYRENE AS INSULATION IN SANDWICH PANELS.

Author(s) : TOLPPANEN A.

Type of article: Article

Summary

THE TWO INSULANTS ARE COMPARED IN THE MAIN AREAS REQUIRED BY A PANEL INSULATION. POLYURETHANE IS SHOWN AS HAVING BETTER CHARACTERISTICS. WITH A LOWER THERMAL CONDUCTIVITY THE NECESSARY THICKNESS IS REDUCED, PERMEABILITY IS LESS AND MECHANICAL PROPERTIES CONSIDERABLY GREATER, PARTICULARLY WHEN MEETING HIGHER TEMPERATURES. POLYURETHANE IS THERMALLY STABLE TO ABOVE 373 K (100 DEG C) WHEREAS POLYSTYRENE BY THEN HAS LOST RIGIDITY. POLYURETHANE WILL EVEN TOLERATE HOT BITUMEN BEING SPREAD ON IT WITHOUT DAMAGE. CONSTRUCTION STRENGTH IS MADE GREATER BY THE FACT THAT POLYURETHANE IS EXPANDED INTO JIGGED PANEL SHEETS, WHEREAS POLYSTYRENE IS GLUED, OFTEN IN MULTIPLE BLOCKS. FIRE RESISTANCE FOR POLYSTYRENE IS POOR, THE FLASH POINT BEING ONLY 543 K (270 DEG C) AT WHICH TEMPERATURE THE INSULATION IS LIQUID. POLYURETHANE IS ALSO MORE RESISTANT TO SOLVENTS. D.W.H.

Details

  • Original title: POLYURETHANE VERSUS POLYSTYRENE AS INSULATION IN SANDWICH PANELS.
  • Record ID : 1988-0953
  • Languages: English
  • Source: ScanRef - vol. 16 - n. 4
  • Publication date: 1987/06
  • Document available for consultation in the library of the IIR headquarters only.

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