Universal science tflex 200 gap filler universal science tflex2001mm tflex 200 is a very soft freestanding gap filler that is more compressible than most gap fillers it combines good thermal conductivity with high compressibility to produce low thermal resistance it is electrically insulating and is naturally tacky so does not require additional adhesive coating that can inhibit thermal performance universal science tflex2001mm t flex 200 gap filler 3x3sheet 1mm thick