an electro spinning process yields uniform , nanometer diameter polymer filaments . a thread - forming polymer is extruded through an anodically biased die orifice and drawn through an anodically biased electrostatic field . a continuous polymer filament is collected on a grounded collector . the polymer filament is linearly oriented and highly uniform in quality . the filament is particularly useful for weaving body armor , for chemical / biological protective clothing , as a biomedical tissue growth support , for fabricating micro sieves and for microelectronics fabrication .