Casting compounds which can be produced on the basis of polyurethanes by reacting an A component with a B component, the A component being polyols, natural oils or oil derivatives, catalysts, a micronized molecular sieve or zeolite and active fillers and the B component di- and / or contain polyisocyanates, characterized in that the A component, comprising a combination C, containing a short-chain polyether alcohol based on a sugar or sugar alcohol of hydroxyl functionality ≥ 4 (C1), a hydroxyl-functional natural oil, a functionalized natural oil or an epoxidized natural Oil (C2), and diols (C3) acting as chain extenders, a combination D containing nanoscale aluminum oxide, hydroxide and / or oxide hydroxide (D1) and nanoscale silicon carbide (D2), and a combination E containing a dialkyltin dicarboxylate or tin dicarboxylate (E1) and a dialkyltin dithiocarboxylate (E2), and the B components nte mixed at temperatures from 0 to 70 ° C and implemented with shaping.
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