Method for producing a rubber spring , wherein the method comprises the following steps: a) providing a moulding tool which has a plurality of moulding tool parts , wherein the moulding tool is configured such that the moulding tool can be moved between a closed position, in which the moulding tool parts enclose a moulding chamber , and an open position, in which the moulding tool parts are at least partially spaced apart from one another and, as a result, the moulding chamber is accessible from the outside, and wherein, in the closed position, the moulding tool forms a mould surface which encloses the moulding chamber and which has a plurality of channel openings which each lead to inflow channels ; b) moving the moulding tool into the open position; c) inserting a head connection unit and a foot connection unit into receiving seats which are configured on the mould surface of the moulding tool , wherein the head connection unit comprises at least one upper plate which is configured for fastening of an air spring bellows , and wherein the foot connection unit comprises at least one connection plate which is configured for fastening to a chassis of a vehicle ; d) moving the moulding tool into the closed position, wherein the channel openings are arranged distributed in a lateral portion of the mould surface between the receiving seats ; e) conveying a first rubber material through the inflow channels and the channel openings into the moulding chamber of the moulding tool , which is in the closed position; f) conveying a second rubber material through the inflow channels and the channel openings into the moulding chamber , after step e) has ended, wherein the second rubber material contains flame retardant and the moulding tool remains in the closed position between step e) and f); and g) joint vulcanization of the first and second rubber material, such that this, together with the head connection unit and the foot connection unit , produces a rubber spring . a) providing a moulding tool which has a plurality of moulding tool parts , wherein the moulding tool is configured such that the moulding tool can be moved between a closed position, in which the moulding tool parts enclose a moulding chamber , and an open position, in which the moulding tool parts are at least partially spaced apart from one another and, as a result, the moulding chamber is accessible from the outside, and wherein, in the closed position, the moulding tool forms a mould surface which encloses the moulding chamber and which has a plurality of channel openings which each lead to inflow channels ; b) moving the moulding tool into the open position; c) inserting a head connection unit and a foot connection unit into receiving seats which are configured on the mould surface of the moulding tool , wherein the head connection unit comprises at least one upper plate which is configured for fastening of an air spring bellows , and wherein the foot connection unit comprises at least one connection plate which is configured for fastening to a chassis of a vehicle ; d) moving the moulding tool into the closed position, wherein the channel openings are arranged distributed in a lateral portion of the mould surface between the receiving seats ; e) conveying a first rubber material through the inflow channels and the channel openings into the moulding chamber of the moulding tool , which is in the closed position; f) conveying a second rubber material through the inflow channels and the channel openings into the moulding chamber , after step e) has ended, wherein the second rubber material contains flame retardant and the moulding tool remains in the closed position between step e) and f); and g) joint vulcanization of the first and second rubber material, such that this, together with the head connection unit and the foot connection unit , produces a rubber spring . <EOS>