Abstract: A vinyl chloride resin elastomer composition comprises 100 parts by weight of a resin mixture comprising from 50 to 95 parts by weight of a vinyl chloride resin and from 5 to 50 parts by weight of a chlorinated polyethylene; from 20 to 400 parts by weight of an acrylonitrile-butadiene rubber containing a tetrahydrofuran-insoluble crosslinking component; and from 10 to 300 parts by weight of a plasticizer.

Abstract: A method for providing a dust-proof boot for a protruding equipment shaft of the type including a pair of spaced apart annular grooves. The boot includes an expandable central belly portion, a pair of restricted diameter attachment ring portions adapted to be received in the shaft grooves, and a pair of connecting portions connecting the attachment ring portions to the belly portion. It is formed by first forming a parison on a male die. The parison includes preformed attachment ring portions and connecting portions, at least one of which includes an inwardly protruding annular ridge member which is received in a mating recess in the die. The parison and the male die are inserted into a female blow-molding, die, with the preformed attachment ring portions and connecting portions caught and supported between the male and female dies.

Abstract: A method of and an apparatus for air-pressure forming of a sheet of thermoplastic resin wherein a sheet of thermoplastic resin is formed to a desired shape under a substantially constant controlled air pressure. The apparatus includes a compressed air generating device comprising an air cylinder having a first piston slidable therewithin, a hydraulic cylinder having a second piston slidable therewithin and connected mechanically to the first piston, whereby compressed air pressure produced by the first piston balances with hydraulic pressure so as to be maintained at a substantially constant level during the whole forming operation.