One of the actual and practical problems during semi-products and parts quenching is distortion and residual stresses reduction. These problems are effectively decided by using an cooling aqueous polymer medium as regards thin sheet and extruded parts, forgings (having especially complex configuration). It is discussed the quenchant, containing additions of the two polymers in low concentration (up to 1,5%). The medium is distinguished by low expense and good cleaning of polymers. It has been examined the mechanism and cooling rate in the medium, quench sensitivity of aluminium alloys of different system. The mechanical properties (static, fatigue, crack resistance) and the corrosion characteristics of alloys and the products, designated for polymer quenching, has been investigated. The medium allows to reduce distortion of sheet parts by 3-5 times and to decrease the level of residual stresses in forging up to 50% due to increasing of uniformity and stability of the cooling process. The cooling rate is enough high for obtaining optimum structure and thus for ensuring the properties.