Abstract
Fluorogold, a glass-filled teflon, is widely used as a long-wave pass filter in the infrared. We have found an important intrinsic polarization arising from the scattering of the radiation by the aligned grains of the reinforcing aggregate bound by teflon. The effect must be taken into account in the case of Fluorogold filters employed with a polarizing Michelson interferometer for measurements of absolute fluxes, as in the course of observations of the cosmic background spectrum carried out by several authors.
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