A body of material treated by a glow discharge process is enclosed in a bell jar vessel removably suspended from and sealed to the bottom wall of a casing supported by the post of a stand above its base. Conduit fittings having passages extending into the bottom wall, establish fluid communication between the interior of the vessel and pressure controlling and monitoring apparatus. Power cables extend through the post into the casing, which encloses electrical circuitry connected to electrode assemblies projecting from the bottom wall of the casing into the vessel.
Magnetic recording media consist of a nonmagnetic substrate and at least one magnetizable layer which is firmly applied thereon and is based on a polyurethane binder, not less than 50% by weight of the binder consisting of a high molecular weight branched polyurethane elastomer having OH-containing urea groups at the chain ends, and the frictional properties of the binder being improved and its coefficient of friction reduced by incorporation of perfluoro groups.
