| abstract |
A polystyrene foam board, extruded or expanded, insect-resistant, containing 2 to 25 percent by weight acicular particles such as fiberglass, stone wool, metal wool, plaster, quartz and wolastonite and insulation panels Elaborated from these tables. The fibers are preferably milled or crushed and vary in size from 0.396 mm (0.0156 inches) to 12.7 mm (0.5 inches) in length and 10 to 20 micrometers in diameter. |