the invention relates to a matrix liquid for producing machining suspensions , a machining suspension produced with the matrix and a method of fractionating the used machining suspension yielded after use . the invention also relates to a homogeneous mixture of a polymer or various polymers and water . the mixture can be used especially advantageously in all technical applications requiring a liquid with lubricating properties . in the present invention , a mixture of water and a thickening agent , respectively a polymer or a multiplicity of polymers , is utilized as the matrix liquid or lubricating liquid . the cutting grains can be separated very easily and quickly from the used machining suspension produced with this matrix liquid ; for reuse . less process water is required and the process water can be simply purified as there is no complicated getting rid of an alcohol charge .