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Several blown micro fiber (BMF) electrets recently developed under proprietary technologies have shown significant improvements in efficiency drops when compared with conventional electrets. These electrets have good pleatability, high efficiency and low pressure drop and can be used in a variety of applications, including auto cabin air filters (CAFs). Quantitative data of using oily cigarette smoke particles are presented to illustrate the differences. A newly developed method, which utilizes saturated cigarette smoke particles to characterize the new materials, is also introduced in this paper.

This paper describes the current state of technology for evaluating gas removal filters designed for cabin air filtration. Many automobile manufacturers are aware of the importance of a filtration system to improve cabin air quality. This can be seen by the increasing number of vehicles being produced with such systems in Europe and Japan. The air in the interior of a vehicle contains particulate and gaseous pollutants such as dust, pollen, soot, tobacco smoke, hydrocarbons, oxides of carbon, sulfur and nitrogen (e.g., CO, SO2, NO2), and ozone. To effectively reduce the level of particulate matter entering the vehicle's ventilation system, filters using electrostatically charged media have become the industry standard due to their combination of high particle capture efficiencies, low pressure drop and long life. In combination with these, filters for effectively removing gaseous pollutants are also being developed.