Abstract
Abstract A method for the comparison of mineral wool insulation specimens was studied collaboratively. Exemplar and questioned specimens are compared microscopically for color of resin, shapes and quantity of slugs or shot, relative fiber diameters, and other gross characteristics. Then the resin is burned off, and the fibers are annealed at 500°C. The heat-treated fibers are compared for shortwave ultraviolet fluorescence, microscopic appearance, solubility in dilute and concentrated hydrochloric acid, and refraction and dispcrsion indices according to 45.002–5.007. Eight collaborators in 6 laboratories compared 8 matched pairs of large samples (such as exemplars) and small samples (such as might be found on a suspect’s clothing).
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