SULFUR FOAM A process for producing sulfur foam containing at least 50 weight percent sulfur, which comprises: (a) reacting molten sulfur with an organic protonic acid which is reactive with molten sulfur so as to incorporate the organic acid with sulfur to form a sulfur-organic acid adduct containing protonic acid groups; (b) mixing an organic surfactant agent with the adduct to obtain a mixture of adduct and surfactant agent; and then(c) reacting the mixture with a polyisocyanate to obtain sulfur foam.
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