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Maximized strength-to-weight ratio panel material

  • US 4,351,870 A
  • Filed: 10/22/1979
  • Issued: 09/28/1982
  • Est. Priority Date: 10/22/1979
  • Status: Expired due to Term
First Claim
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1. A decorative and structural panel having a large magnitude strength-to-weight ratio comprising:

  • a plurality of laminated panelling material layers firmly bonded together at a plurality of area-spaced, area-disseminated, multi-point interface attachment and junction locations, said plurality of layers of laminated panelling material including at least one convoluted, weight-reducing, strength-increasing, stiffening layer of structural, formed material having a plurality of convolutions extending transversely from a surface plane thereof, said convolutions having outer contact surface portions in contact with corresponding surface portions of a next adjacent layer, at least said convoluted layer being made of a formable thin sheet of high strength material, said laminated panel further including at least one low-density, high specific volume, expanded, compressible, foam filler material layer containing and surrounding a plurality of hollow cells, said foam filler material having a maximized volume-to-weight ratio and carrying a fire extinguishing agent comprising a halogenated compound in particulate form, said halogenated compound being decomposible when subjected to the heat of combustion and adapted to produce, as a result of decomposition, a fire extinguishing gas.

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