Abstract: The present invention relates to a incandescent material formed from the following mixture of oxides (in moles):50 to 70% zirconium oxide ZrO.sub.2,5 to 8% yttrium oxide Y.sub.2 O.sub.3,13 to 20% magnesium oxide MgO,4 to 10% lithium oxide Li.sub.2 O, and0.2 to 0.6% cerium oxide CeO.sub.2,0 to 25% potassium oxide K.sub.2 O,0 to 1% tungsten oxide WO.sub.3.This material is suitable for producing hard mantles for gas lighting of public places.

Abstract: The invention relates to a process for the preparation of a porous material layer covered with an electronically conductive polymer and to the product obtained by this process.This process consists of placing the layer (1) on a support sheet (3) optionally having roughnesses or unevennesses (4), applying to the layer a polymerization solution comprising a monomer (pyrrole), an oxidizing agent (FeCl.sub.3) and a doping agent (naphthalene disulphonic acid salt) using nozzles (6). The assembly is then wound up to form a composite roll (11), which is then immersed in the same polymerization solution for an adequate time to form a uniform, conductive polymer deposit (polypyrrole).It is thus possible to obtain conductive textiles with surface resistances of 5 to 20 Ohm.sup.2.

Abstract: Apparatus and method for the electrolytic deposition of a metal on a weakly conductive, flexible substrate such as a textile or a paper sheet for the manufacture of flexible heating elements such as heated gloves, heated car seats, panels used in construction for the heating of rooms, etc. Metallic circuits of varying shapes can be formed on the weakly conductive, flexible substrate.