| 摘要 |
An extruded, polystyrene-based resin foam plate produced by extruding a foamable molten composition containing a polystyrene-based resin and a blowing agent consisting of (a) isobutane and (b) a blowing agent component other than isobutane, chlorofluorocarbons and fluorocarbons from a high pressure zone into a lower pressure zone. The extruded foam plate has a thickness of at least 10 mm and an apparent density of 25-60 kg/m3 contains residual isobutane in an amount of 0.45-0.80 mol per 1 kg thereof, has cells having an average diameter in the thickness direction thereof of 0.05-0.18 mm and a cell strain rate of 0.7-1.2, wherein the cell strain rate is obtained by dividing the average diameter in the thickness direction of the extruded foam plate by the average diameter in the horizontal direction of the extruded foam plate, meets the flammability standard on extruded polystyrene foam insulation plates as defined in JIS A9511-1995, and has a thermal conductivity of not greater than 0.028 W/m.K.
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