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Stable bituminous foams based on diphenyl methane-4,4′ diisocyanate (MDI–isocyanate prepolymers) that combine bituminous membranes and polyurethane foams into one material are promising new materials. They are produced in a two-step process: firstly, a reactive modified bitumen is obtained by mixing a bitumen and a prepolymer, and, secondly, a bituminous foam is formed by a reaction of an excess of...
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