Abstract: The present disclosure relates to a seamless model free of bond lines made by a method which includes the steps of providing a substructure having an exposed outer surface, applying a modeling paste to the outer surface of the substructure in the form of a continuous layer, curing the continuous layer of applied modeling paste, and machining said cured layer of modeling paste to the desired contour to form the seamless model. The modeling paste may be a mechanically frothed syntactic foam prepared by injecting inert gas with mechanical stirring into either a formed froth-forming polyurethane or epoxy composition containing microballoons.

Abstract: The present disclosure relates to a seamless model free of bond lines made by a method which includes the steps of providing a substructure having an exposed outer surface, applying a modeling paste to the outer surface of the substructure in the form of a continuous layer, curing the continuous layer of applied modeling paste, and machining said cured layer of modeling paste to the desired contour to form the seamless model. The modeling paste may be a mechanically frothed syntactic foam prepared by injecting inert gas with mechanical stirring into either a formed froth-forming polyurethane or epoxy composition containing mieroballoons.

Abstract: The invention relates to a seamless model free of bond lines and to a method of making same. The method includes the sequential steps of providing a substructure having an exposed outer surface, applying a modeling paste to the outer surface of the substructure in the form of a continuous layer, curing the continuous layer of applied modeling paste, and machining said cured layer of modeling paste to the desired contour. The modeling paste of the invention is a mechanically frothed syntactic foam prepared by injecting inert gas with mechanical stirring into either a formed froth-forming composition, which is preferably a polyurethane or epoxy froth-forming composition containing microballoons.

Abstract: The invention relates to a seamless model free of bond lines and to a method of making same. The method includes the sequential steps of providing a substructure having an exposed outer surface, applying a modeling paste to the outer surface of the substructure in the form of a continuous layer, curing the continuous layer of applied modeling paste, and machining said cured layer of modeling paste to the desired contour. The modeling paste of the invention is a mechanically frothed syntactic foam prepared by injecting inert gas with mechanical stirring into either a formed froth-forming composition, which is preferably a polyurethane or epoxy froth-forming composition containing microballoons.

Abstract: A process for making a cured plastics moulding by introducing a curable resin composition to a heated mould and supplying further resin under pressure to compensate for shrinkage of the composition including heating the curable resin composition either before entry or as quickly as possible on entry into the mould, or both to a temperature which permits the satisfactory filling of the mould before gelation and subsequent progressive gel from the point furthest from entry, back to the point of the mould entry, and wherein the entry parts of the mould are heated to a temperature at least as high as the temperature of the final fill point of the mould.