Abstract: Compositions for producing unsaturated polyester foams comprising sodium borohydride for curing the composition in conjunction with an organic peroxide catalyst, and for producing hydrogen gas as the foaming agent. The compositions which are simple and safe to prepare produce high quality foams.

Abstract: Smoke suppressants, as distinguished from fire retardants, are disclosed for chlorine-containing resinous organic materials. The smoke suppressant comprises iron oxalate, zinc oxalate, zinc octoate, and mixtures thereof. Especially effective synergistic mixtures are a mixture of ferrous oxalate and zinc octoate and a mixture of ferrous oxalate and zinc oxalate.

Abstract: A two component system is disclosed for forming rigid polyester reaction products in which each component is storable for an appreciable period of time but reacts upon contact with each other to form the rigid reaction product within a relatively short time. One component comprises a pre-catalyzed polyester resin which normally has a short pot life but which is extended by an excessive amount of an inhibitor. The second component is a synergistic accelerator combination consisting essentially of a metal soap and an aromatic tertiary amine. When the two components interreact, the accelerator combination overcomes the action of the excessive amount of the inhibitor and brings about a normal polymerization of the polyester resin. Optionally, the accelerator combination is part of a fibrous reinforcement and the aromatic amine is solid at room temperatures. This enables the second component to be more readily used in a dry, handleable form for easy storage.