Process for continuous production of polyurethane foam having an apparent density according to DIN EN 826:05/2013 of not more than 32 kg/m 3, comprising the steps of i) providing an isocyanate component A comprising A1 55-90% by weight of monomeric methylenediphenyl isocyanate based on the total amount of isocyanate component A, an isocyanate-reactive component B comprising isocyanate-reactive compounds having alkylene oxide units, wherein, if the isocyanate-reactive component B comprises one or more polyether polyols, the alkylene oxide units in the polyether polyol(s) on arithmetic average comprise less than 40% by weight of ethylene oxide based on the total amount of the alkylene oxide units in the polyether polyol(s), a catalyst component C, a blowing agent component D comprising water, a foam stabilizer component E and optionally an auxiliary and/or additive component F comprising auxiliary and/or additive substances, ii) mixing the components A, B, C, D and E and optionally F, wherein the index is 85-125, to obtain a mixture, iii) dispensing the mixture obtained in step ii) from a dispensing apparatus onto a surface, wherein the surface and the dispensing apparatus are in continuous motion relative to one another during at least part of said dispensing, to obtain a dispensed mixture, iv) foaming the dispensed mixture obtained in step iii) on the surface to obtain a foamed mixture, v) curing the foamed mixture obtained in step iv) to obtain the polyurethane foam. i) providing an isocyanate component A comprising A1 55-90% by weight of monomeric methylenediphenyl isocyanate based on the total amount of isocyanate component A, an isocyanate-reactive component B comprising isocyanate-reactive compounds having alkylene oxide units, wherein, if the isocyanate-reactive component B comprises one or more polyether polyols, the alkylene oxide units in the polyether polyol(s) on arithmetic average comprise less than 40% by weight of ethylene oxide based on the total amount of the alkylene oxide units in the polyether polyol(s), a catalyst component C, a blowing agent component D comprising water, a foam stabilizer component E and optionally an auxiliary and/or additive component F comprising auxiliary and/or additive substances, an isocyanate component A comprising A1 55-90% by weight of monomeric methylenediphenyl isocyanate based on the total amount of isocyanate component A, an isocyanate-reactive component B comprising isocyanate-reactive compounds having alkylene oxide units, wherein, if the isocyanate-reactive component B comprises one or more polyether polyols, the alkylene oxide units in the polyether polyol(s) on arithmetic average comprise less than 40% by weight of ethylene oxide based on the total amount of the alkylene oxide units in the polyether polyol(s), a catalyst component C, a blowing agent component D comprising water, a foam stabilizer component E and optionally an auxiliary and/or additive component F comprising auxiliary and/or additive substances, ii) mixing the components A, B, C, D and E and optionally F, wherein the index is 85-125, to obtain a mixture, iii) dispensing the mixture obtained in step ii) from a dispensing apparatus onto a surface, wherein the surface and the dispensing apparatus are in continuous motion relative to one another during at least part of said dispensing, to obtain a dispensed mixture, iv) foaming the dispensed mixture obtained in step iii) on the surface to obtain a foamed mixture, v) curing the foamed mixture obtained in step iv) to obtain the polyurethane foam.