Accession Number : AD0271462

Title :   EFFECT OF WINDOW GLASS IN PROTECTING MATERIALS FROM IGNITION BY THERMAL RADIATION

Corporate Author : FOREST PRODUCTS LAB MADISON WIS

Personal Author(s) : DOWNS,L.E. ; BRUCE,H.D.

Report Date : 01 NOV 1955

Pagination or Media Count : 1

Abstract : Window glass protection of combustible materials from ignition by thermal radiation in the event of nuclear weapon explosion is discussed. The critical ignition energies of 22 materials were measured by exposure to the radiation of a graphite plate at 4200 F., with and without a filter of single strength window glass. To barely ignite a material, the energy per unit area reaching the glass had to average almost twice (average factor 1.83) the energy reaching the material directly. The protective effect varied with the test material. The protection by glass could not be calculated from the spectral emittance of the source, the spectral transmittance of the glass, and the spectral absorptance of the materials tested, without taking into consideration other properties such as the diathermancy of the materials and their change of transmittance and diathermancy during the interval of irradiation. The protective effect of glass was less against fire ball radiation than against the graphite plate radiation. (Author)

Descriptors :   *GLASS, *THERMAL INSULATION, *THERMAL RADIATION, COMBUSTION, INHIBITION, MATERIALS, NUCLEAR EXPLOSIONS, PAPER, TEST METHODS, TEXTILES

Distribution Statement : APPROVED FOR PUBLIC RELEASE