Abstract
Abstract The comparison of glass wool, slag wool, and rock wool insulations by means of refractive index and dispersion is practical and effective. The material is annealed at >1150°–1200°F; this process burns off the resinous coating and leaves the fibers and slugs suitable for microscopic study, solubility tests, fluorescence observations, and refractive index and dispersion measurements. Refractive index and dispersion values for the annealed fibers are obtained by the Emmons double variation method, using a hot stage, a monochromator, and a phase microscope. In a study of 34 mineral wool insulations, a range of refractive indices was obtained that was 7 times the range exhibited by window glasses. In one case the value of the method was proven when insulations from 3 sources were each matched with fibers and slugs from a suspect’s clothes.
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