TECHNOLOGY FOCUS - TEXTILES AND PAPER - Preferred Fibers: The fibers have an inner diameter of 1-10 nm and a dielectric constant below 4.Preferred Materials: The outside wall (optionally multi-layered) is:(a) poly(p-xylylene), polyacrylamide, polyimide, polyester, polyolefin, polycarbonate, polyamide, polyether, polyphenylene, polysilane, polysiloxane, polybenzimidazole, polybenzthiazole, polyoxazole, polysulfide, polyesteramide, polyarylenevinylene, polylactide, polyetherketone, ormocer, polyacrylate, silicone, fully-aromatic copolyester, poly-N-vinylpyrrolidone, polyhydroxyethylmethacrylate, polymethylmethacrylate, polyethyleneterephthalate, polybutyleneterephthalate, poly(meth)acrylonitrile, polyvinyl acetate, neoprene, Buna N, polybutadiene, PTFE, optionally modified cellulose, alginates and/or collagen;(b) a Group Ia, Ib, IIa, IIb, IIIa, IIIb, IVa, IVb, Vb, VIb, VIIb and/or VIIIb metal or alloy; or(c) glass, glass-ceramics, SiOx, perovskite, ceramics, Al oxides or Zr oxides.The first (degradable) material contains 10-60 wt.% noble metal salt and optionally also a basic compound and can be coated with a material obtained by polymerization, polycondensation or polyaddition, especially of Me methacrylate, styrene, styrene sulfonate, 1,6-hexamethylenediisocyanate, 4,4'-methylenebiscyclohexyldiisocyanate, 4,4'-methylenebis(benzyldiisocyanate), 1,4-butanediol, ethylenediamine, ethylene, butadiene, 1- or 2-butene, vinyl alcohol, acrylonitrile, vinyl chloride, fluorinated ethylenes or terephthalates. Preferred Process: The degradation to produce the fibers is effected thermally, chemically, biologically, photochemically or by radiation-, plasma- or ultrasonic-treatment or by solvent-extraction. EXAMPLE - Polylactide fibers useful in scanning electron microscopy were obtained by electrospinning at 48 V a 5 % solution (conductivity below 10-7 microS/cm) of poly-L-lactide in CH2Cl2 also containing 50 wt.% (based on the polymer) of Pd(OAc)2, the distance between the 0.3 mm diameter nozzles and the glass substrate being 10 cm.