Abstract: Methods and apparatus for determining the permeation behavior of foreign fluid molecules into solids whereby the results are typically obtained in less than one day. In a principal embodiment, information about the relationship between the saturation concentration and the diffusion constant of the solid is obtained by subjecting a first, thick, sample of the solid to the foreign fluid substance, which has been radioactively-tagged with a class C isotope, for a short diffusion time interval. The penetrated foreign substance is then washed out of the thick sample with an untagged solvent and the resulting solution is then analyzed to determine the quantity of the foreign substance that has diffused into the thick sample for the diffusion time. A second, thin, sample of the solid is prepared, and analyzed in a series of steps analogous to the thick, sample, whereby information concerning the saturation concentration, individually, is obtained.

Abstract: A process for galvanic coating of a selected area on a preform, comprising applying an electrically conducting metallic primer to substantially the entire surface of the preform; masking a portion of the surface coated leaving exposed an unmasked portion not to be coated; forming a clear coat to the exposed portion not to be galvanized; removing the mask to expose the portion of the surface not clear coated; and galvanically coating the area of metallic primer.

Abstract: A novel method of blow molding and fluorinating plastic containers carried out in essentially three steps, including blow molding of the container at a first predetermined pressure in a mechanically locked mold with an inert gas, testing the mold for pressure tightness at a second higher level of pressure with an inert gas, and thereafter introducing a fluorine containing gas into the mold at a third level of pressure.

Abstract: The disclosure relates to a device with a flat component made of fiber-reinforced synthetic material and an end power induction unit, in particular a leaf spring or transverse link for motor vehicles. The flat component essentially enters the power induction unit without a change in fiber direction and is contained therein by a clamp. The contact point on the power induction unit is displaced by a distance "a", asymmetrically to the fiber levels such that a resultant of perpendicular forces and forces acting parallel to the fiber direction cause a reduction in stress and momentary relief. The portion of the flat component in the power induction unit has a length, using the perpendicular projection of the point of application of force, that is at least two-thirds of the length from the point of application of force to the resultant in the fiber plane or at least corresponds to quantity "a".

Abstract: A piston composed at least in part of fiber-reinforced synthetic resin material, is provided with a piston base or bottom, a piston shaft or shank, and eyes for engagement with a member to be driven by or for driving the piston. According to the method of this invention, the piston bottom and piston shaft are fabricated separately and are form-fittingly interconnected while the eyes are enclosed in a body which is fixed to the piston shaft and abuts at opposite end this shaft and the piston bottom. At least this body and the shaft are formed by a winding of fiber roving impregnated with hardenable synthetic.

Abstract: A method of making a connecting rod for an internal combustion engine having a one-piece crankshaft construction generally consisting of positioning a first crankpin bushing segment having a connecting rod shank consisting of a reinforced resinous material mounted thereon, on a crankpin of the crankshaft, positioning a second crankpin bushing segment on the crankpin, and applying a reinforcing material and a resinous material about a periphery of the connecting rod shank and the second crankpin bushing segment to form an integral unit consisting of the crankpin bushing segments embedded in the connecting rod shank, attached to the crankpin.