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Different heat shielding unilayer materials already in practical use and multilayer materials, consisting of a compound of E-glass fabric laminated with aluminum foil and different high temperature felts, are compared with regards to the difference between the external and internal surface temperature ΔT as a function of the external surface temperature. Beside that the general difference between the two standard methods convection heat measurement and radiant heat measurement is shown. Especially it is evaluated whether the radiant heat measurement method is suitable to make a general statement for classification of heat shielding materials.

Different temperature resistant glass fiber fabrics with a laminated aluminum layer on one side are analyzed regarding their ΔT behavior under convection heat transmission and radiant heat. The influences of material thickness as well as different exposure temperatures are investigated. The measured readings are compared by means of a controlled industrial air blower test set-up and two different measuring stations for heat radiation measurements (one according to SAE J2302). Road test data are used to derive a comparative statement on the potential practice-oriented suitability of the two different measuring methods during the engineering phase.

Compound materials, consisting of temperature proof glass fiber fabrics and a laminated aluminum layer, are compared in relation to material thickness in the range of up to 200°C to investigate their ΔT behavior under convection heat transmission and radiant heat. Two different technologies for production of 300°C materials are presented, and their advantages and disadvantages are explained. Supported by measurements, this article describes the dependence of the material tensile strength on temperature and temperature cycling.