开封龙亭区鼓楼美孚液压油-导轨油68号销售The viscosity grading of hydraulic oil uses the first central value of the 40℃运动粘度 as the viscosity grade, which is divided into eight grades. Hydraulic oil No. 68 means that the central value of the 40℃运动粘度 of this hydraulic oil is 68mm²/s It is essential to choose the right viscosity of hydraulic oil to ensure the normal operation of the hydraulic system, as the viscosity affects the lubrication, cooling and sealing performance of the hydraulic. In practical application, different viscosities of hydraulic oil should be used according to the requirements of the equipment and the external environment. For example, No. 46 hydraulic is more suitable for use in temperate regions or in winter because of its lower viscosity; while No. 68 hydraulic oil is suitable for use in subtropical regions or summer because of its higher viscosity