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Chris Wilkson <cwilkson@...> added the photo album Chemically Melted Rubber Insulation : Photo showing 2 types of rubber insulation break down when stored on a typical blue rubber ESD mat. One break down mode is a typical chalky white powder on the surface of the insulation, easily removed. The other break down mode is a liquification of the black rubber insulation *and* the blue ESD mat that it was sitting on (and above, but not in contact). The liquid is quite viscous (similar to honey) and this state is permanent.