Abstract

The electrical resistivity of carbon fiber (3 mm long, pitch-based) reinforced gypsum plaster decreased monotonically with increasing fiber content, reaching a resistivity of 600Ω cm (0·02% of the plain gypsum plaster value) at a fiber content of 2·0% by weight of the gypsum. The electromagnetic interference shielding effectiveness increased monotonically with increasing fiber content, reaching a shielding effectiveness of 22 dB at 1·5 GHz for a plaster thickness of 4·35 mm and a fiber content of 2·0% by weight of the gypsum. Even with as little as 0·3% fibers, the shielding effectiveness was 10 dB at 1·5 GHz for a plaster thickness of 3·85 mm. The additional use of chemical agents (sodium citrate, cement and aluminum sulfate 18-hydrate) increased the electrical resistivity and had little effect on the shielding effectiveness, though the chemical agents strengthened the plaster.

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