Abstract: A binder for cork chips is provided by an RTV organopolysiloxane composition comprising (1) a diorganopolysiloxane blocked with an alkoxysilyl group at either end of its backbone, (2) a crosslinking agent in the form of an alkoxysilane or a partial hydrolysate thereof, (3) an organic titanate, (4) a network polysiloxane comprising triorganosiloxy and SiO.sub.2 units and having a terminal SiOH group blocked with an alkoxysilyl group, and (5) an epoxy-modified alkoxysilane or a partial hydrolysate thereof. Cork plugs are obtained by mixing the composition with cork chips followed by molding and curing.

Abstract: An apparatus for forming seal liners of thermoplastic material within closure cap shells comprisies: a plurality of movable dies each having an inner die and an annular outer die both of which are movable up and down in relatively slidable relation with each other and arranged so that the inner die takes its lowermost position after the outer die has taken its lowermost position; means for restricting downward movement of the outer die so as to provide a constant clearance between its lower end and an internal surface of a cap shell to be worked with, so that an annular foaming chamber of a constant capacity is formed beneath the lower end of the outer die; and a plurality of gas discharging grooves are provided so as to be communicated with the foaming chamber.