Abstract: Dry resin powder can be used to impregnate a laminate lay up, by coating a dry resin powder directly onto a bare fibrous sheet, and then subjecting a plurality of sheets including at least one dry resin-coated sheet to an amount of heat and pressure effective to consolidate the sheets.

Abstract: A porous encapsulating composition is formed of particulate filler material which is cohesively bonded together by a binder material which forms beads around the points of contact between contiguous particles. In one embodiment, the filler material includes round gravel and resin-coated sand particles with the resin being redistributed to form beads around the points of contact between contiguous particles.

Abstract: A method of encapsulating electrical apparatus in a particulate filler material which is cohesively bonded together by a binder material which forms beads around the points of contact between contiguous particles. The filler material includes uncoated and dry, resin-coated particles, with the dry resin being redistributed after the particles of filler are in position about the electrical apparatus by the step of liquifying the resin coating with a liquid solvent, to form beads around the points of contact between contiguous particles.

Abstract: A method of curing phenolic resin near exposed polyethyleneterephthalate subject to degradation by vaporous materials, comprises removing free phenol from the phenolic resin and heating the resin to a cured state.

Abstract: A stripper composition for thermoset resins is disclosed which comprises about 1 to about 99% of an aromatic compound which has a boiling point over 180.degree. C. and is a phenol or a primary or secondary amine, and about 1 to about 99% of a carboxylic acid compound which has a boiling point over 180.degree. C. and is a rosin acid or a mono- or di-carboxylic fatty acid or an ester thereof. The composition also preferably includes sufficient hydrogen bonding compound to react with any acid present in the composition plus about 20 to about 50% in excess of that amount. A swelling agent is also preferably included.

Abstract: A porous encapsulating composition is formed of particulate filler material which is cohesively bonded together by a binder material which forms beads around the points of contact between contiguous particles. In one embodiment, the filler material includes round gravel and resin-coated sand particles with the resin being redistributed to form beads around the points of contact between contiguous particles.

Abstract: An apparatus and method are disclosed for stripping plastics from articles such as motors by use of a stripping fluid. The apparatus has two heated tanks each having a large lid with a gas exit, a third tank, and means for pumping fluid between any two of the tanks. After the stripping fluid in one heated tank has removed the plastic from articles in that tank, it is pumped to the second heated tank and a washing fluid is pumped from the third tank to the first tank. A fourth tank may also be used to hold excess when a heated tank capacity is not being fully utilized.

Abstract: A printed circuit board is prepared by connecting electronic components to the circuit, coating the board with a layer up to about 0.1 mil thick of a compound of the formula C.sub.n F.sub.2n.sub.+1 C.sub.m X.sub.2m.CHY--OOC--C(R)=CH.sub.2 or its prepolymer, replacing at least one of the electronic components, thermally bonding another electronic component to the circuit, and recoating the area around the new component with a layer of the compound or its prepolymer. In the formula n is 2 to 9, m is 1 to 9, X and Y are H, F Cl, or Br and R is --H or --CH.sub.3. This method enables a printed circuit board to be easily repaired since the coating on the board can be soldered or welded through without first removing the coating or protecting the surrounding coating.