Abstract：To enhance the filter efficiency for fine particles, a natural mineral electret Tourmaline with adsorbability were used to make a new electret filter material through solution deposition and thermocompression bonding. The results indicated that the pressure drop across the surfactant-pretreated filters (SPFs) was nearly the same as the untreated filter. The efficiency of fine particles to SPFs was obviously higher than untreated filter, and the efficiency increases as aerosol size decreases. Different to traditional electret filter, no change was discovered to the efficiency of new electret filter for fine particles after 200℃ high temperature treated. The absorbability was more obvious with the higher purity of tourmaline, the efficiency increasing for 0.3, 0.5, 0.7, 0.9, 1, 2.5μm particles were 18.52%, 18.01%, 16.84%, 15.76%, 13.35%, 11.49% respectively by the tourmaline purity of 87.52%, the tourmaline purity of 80.61% were 11.57%, 11.20%, 9.94%, 9.75%, 8.47%, 9.76% and the tourmaline purity of 78.87% were 9.24%, 9.26%, 7.75%, 7.77%, 6.06%, 5.90%. The efficiency increasing of tourmaline with 25μm average particle size for 3μm particles was less than 2%.
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