A long-fiber injection molding process for the preparation of a combustion-modified, fiber-reinforced polyurethane composite, comprising:- applying a fiber-reinforced layer, dispensing over an open mold a flame-resistant polyurethane-composite forming composition comprising; a curable polyurethane resin, a filler and a fiber, the resin comprising an isocyanate-reactive composition and an isocyanate composition, wherein a) the isocyanate-reactive composition comprises: - a polyol component comprising at least one polyether polyol having a nominal functionality of at least 2 and a molecular weight of 150 to 1,000, in an amount of at least 10% by weight of the curable polyurethane resin; and - at least one isocyanate-reactive brominated compound, in an amount of at least 6% by weight of the curable polyurethane resin; b) the isocyanate composition comprises a polyisocyanate component comprising at least one methane diphenyldiisocyanate and/or polymeric MDI, having a nominal functionality of at least 2, in an amount of at least 20% by weight of the curable polyurethane resin; c) the filler comprising at least one metal hydrate particulate filler selected from Al 3, Mg 2 and hydromagnesite, in an amount of at least 10% by weight of the flame-resistant polyurethane-composite forming composition; and d) the fiber being selected from glass fiber, carbon fiber, boron fiber, and high-melting polymeric fibers, in an amount of at least 20% by weight of the flame-resistant polyurethane-composite forming composition; closing the mold so as to shape and consolidate the composite under pressure, demolding and then trimming the resulting composite. applying a fiber-reinforced layer, dispensing over an open mold a flame-resistant polyurethane-composite forming composition comprising; a curable polyurethane resin, a filler and a fiber, the resin comprising an isocyanate-reactive composition and an isocyanate composition, wherein a) the isocyanate-reactive composition comprises: - a polyol component comprising at least one polyether polyol having a nominal functionality of at least 2 and a molecular weight of 150 to 1,000, in an amount of at least 10% by weight of the curable polyurethane resin; and - at least one isocyanate-reactive brominated compound, in an amount of at least 6% by weight of the curable polyurethane resin; b) the isocyanate composition comprises a polyisocyanate component comprising at least one methane diphenyldiisocyanate and/or polymeric MDI, having a nominal functionality of at least 2, in an amount of at least 20% by weight of the curable polyurethane resin; c) the filler comprising at least one metal hydrate particulate filler selected from Al 3, Mg 2 and hydromagnesite, in an amount of at least 10% by weight of the flame-resistant polyurethane-composite forming composition; and d) the fiber being selected from glass fiber, carbon fiber, boron fiber, and high-melting polymeric fibers, in an amount of at least 20% by weight of the flame-resistant polyurethane-composite forming composition; a) the isocyanate-reactive composition comprises: - a polyol component comprising at least one polyether polyol having a nominal functionality of at least 2 and a molecular weight of 150 to 1,000, in an amount of at least 10% by weight of the curable polyurethane resin; and - at least one isocyanate-reactive brominated compound, in an amount of at least 6% by weight of the curable polyurethane resin; - a polyol component comprising at least one polyether polyol having a nominal functionality of at least 2 and a molecular weight of 150 to 1,000, in an amount of at least 10% by weight of the curable polyurethane resin; and - at least one isocyanate-reactive brominated compound, in an amount of at least 6% by weight of the curable polyurethane resin; b) the isocyanate composition comprises a polyisocyanate component comprising at least one methane diphenyldiisocyanate and/or polymeric MDI, having a nominal functionality of at least 2, in an amount of at least 20% by weight of the curable polyurethane resin; c) the filler comprising at least one metal hydrate particulate filler selected from Al 3, Mg 2 and hydromagnesite, in an amount of at least 10% by weight of the flame-resistant polyurethane-composite forming composition; and d) the fiber being selected from glass fiber, carbon fiber, boron fiber, and high-melting polymeric fibers, in an amount of at least 20% by weight of the flame-resistant polyurethane-composite forming composition; closing the mold so as to shape and consolidate the composite under pressure, demolding and then trimming the resulting composite.