Abstract: A heat expanding, fire retardant composition comprising an intumescent component, an organic char-forming component, fillers, plasticizers, fire retardants, and a binder wherein the binder is a polyurethane which is formed in situ.

Abstract: A method for centrifugally casting thermosetting plastics and the like, this method including the following steps of assembling and closing a casting mold having an upper portion and a lower portion; placing a prepared dividing hub onto and over a plurality of drive pins provided on a spinner carried by a stationary base, said dividing hub having a reservoir engaging a plurality of prepared closed casting molds onto and over a like number of nozzles, each of said nozzles extending radially from the sides of said dividing hub; placing and tightening a clamping means around the perimeter of the casting molds; pouring a pre-measured quantity of the thermosetting plastic into said reservoir in the dividing hub; moving a vacuum hood to the stationary base and with gasket means forming a vacuum chamber with said stationary base; evacuating the now closed vacuum chamber; forming and providing a conduit connecting an extreme tip of each of said nozzles with a bottom portion of the reservoir and then spinning the cast

Abstract: An apparatus and method for centrifugal casting of thermosetting plastic and the like in a vacuum chamber including a vacuum chamber for enclosing a rotating spinner journaled in a stationary base, a dividing hub removably engaging the spinner, a reservoir for holding the casting material within the dividing hub, the dividing hub additionally adapted to equally distribute the casting material to a plurality of nozzles extending outwardly from the dividing hub, a plurality of casting molds removably engaging the nozzles, a sleeve within a mouth of the casting mold forming a seal between the casting mold and the nozzle while reducing mold wear, a removable clamp for retaining the plurality of casting molds to the dividing hub during the spinning cycle, the plurality of casting molds additionally adapted for removal from the apparatus for transfer to a remote curing station.

Abstract: This disclosure teaches a system for placing structurally an inorganic alkaline sealant (such as portland cement) by dispersing the alkaline sealant in a polyurethane foam material. The foam material may be cast and fabricated into bands, gaskets, joint packings and other structural elements which are placed in locations such as joints, cracks or the like where they are needed for sealing or protective functions. The alkaline sealant forms a rocklike mass when exposed to water and also releases alkalinity so as to protect adjacent metal surfaces. Gradual release of the alkalinity sustains protection of the metal surfaces for an extremely long time.