A process for the production of a polyurethane elastomer comprising reacting a reaction mixture by a reaction injection molding technique, wherein the reaction mixture comprises: a polyisocyanate component having an NCO group content of 20 to 45% by weight, a functionality of 2.0 to 2.7, and is selected from the group consisting of (i) trimerized 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethylcyclohexane and less than 20% by weight of trimerized hexamethylene diisocyanate, and (ii) a prepolymer that comprises the reaction product of at least 65% to less than 100% by weight, based on 100% by weight of the polyisocyanate component, of trimerized 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethylcyclohexane, and from greater than 0% to no more than 35% by weight, based on 100% by weight of the polyisocyanate, component, of an isocyanate-reactive component having from 2 to 6 hydroxyl groups capable of reacting with NCO groups of and a molecular weight of 60 to 4,000, wherein the NCO group content of the prepolymer is from 10% to 35%; with an isocyanate-reactive component comprising: from 70 to 90% by weight, based on 100% by weight of, of one or more polyether polyols having a functionality of from 2 to 8, a molecular weight of 1,000 to 8,000 and is free of amine groups; from 10 to 30% by weight, based on 100% by weight of, of one or more organic compounds having a molecular weight of from 62 to 400, having a hydroxyl functionality of 2 to 3, and is free of amine groups, in the presence of a catalyst system comprising: one or more catalysts corresponding to the formula: wherein: m: represents an integer from 3 to 8, and n: represents an integer from 3 to 8; and one or more tin catalysts; and, optionally, one or more additives; wherein the relative amounts of and are such that the isocyanate index ranges from 90 to 120. a polyisocyanate component having an NCO group content of 20 to 45% by weight, a functionality of 2.0 to 2.7, and is selected from the group consisting of (i) trimerized 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethylcyclohexane and less than 20% by weight of trimerized hexamethylene diisocyanate, and (ii) a prepolymer that comprises the reaction product of at least 65% to less than 100% by weight, based on 100% by weight of the polyisocyanate component, of trimerized 1-isocyanato-3-isocyanatomethyl-3,5,5-trimethylcyclohexane, and from greater than 0% to no more than 35% by weight, based on 100% by weight of the polyisocyanate, component, of an isocyanate-reactive component having from 2 to 6 hydroxyl groups capable of reacting with NCO groups of and a molecular weight of 60 to 4,000, wherein the NCO group content of the prepolymer is from 10% to 35%; with an isocyanate-reactive component comprising: from 70 to 90% by weight, based on 100% by weight of, of one or more polyether polyols having a functionality of from 2 to 8, a molecular weight of 1,000 to 8,000 and is free of amine groups; from 10 to 30% by weight, based on 100% by weight of, of one or more organic compounds having a molecular weight of from 62 to 400, having a hydroxyl functionality of 2 to 3, and is free of amine groups, in the presence of from 70 to 90% by weight, based on 100% by weight of, of one or more polyether polyols having a functionality of from 2 to 8, a molecular weight of 1,000 to 8,000 and is free of amine groups; from 10 to 30% by weight, based on 100% by weight of, of one or more organic compounds having a molecular weight of from 62 to 400, having a hydroxyl functionality of 2 to 3, and is free of amine groups, in the presence of a catalyst system comprising: one or more catalysts corresponding to the formula: wherein: m: represents an integer from 3 to 8, and n: represents an integer from 3 to 8; and one or more tin catalysts; and, optionally, one or more catalysts corresponding to the formula: wherein: m: represents an integer from 3 to 8, and n: represents an integer from 3 to 8; and m: represents an integer from 3 to 8, and n: represents an integer from 3 to 8; one or more tin catalysts; one or more additives; wherein the relative amounts of and are such that the isocyanate index ranges from 90 to 120.