Stay-in-Grade Performance

The shear stable polymers in Castrol Dual Range HV keep the fluid’s viscosity consistent over a wide range of temperatures. High operating temperatures, which may break down other hydraulic oils leading to damage to metal parts and increased oxidation, are easily managed by Castrol Dual Range HV. Also contributing to Castrol Dual Range HV’s excellent viscosity performance is its extra high viscosity index. The high viscosity index of Castrol Dual Range HV (at least 140) indicates that as the temperature dramatically rises or falls, Castrol Dual Range HV will not excessively thin or thicken. This protects your customer’s equipment from premature wear or oil breakdown and leads to decreased maintenance costs.

Water Tolerance

In environments with high risk of water contamination, Castrol Dual Range HV delivers excellent demulsibility and hydrolytic stability. When water penetrates a hydraulic system, Castrol Dual Range HV protects sensitive hydraulic components from damaging rust and corrosion. At the end of the day, Castrol Dual Range HV easily separates water from the oil for removal at the beginning of the next work shift. The creamy cuff that sometimes forms between the water and other hydraulic oils shows that the hydraulic oil is not completely demulsifying and that cuff can encourage oil thickening and foam. Castrol Dual Range HV separates from water cleanly and consistently protecting equipment from damaging foam and thickened oil.

Filterability is another major concern for hydraulic equipment once water has entered the system. In tests where uncontaminated oils were compared with water-contaminated Castrol Dual Range HV in the Denision TP 02100 test, oil filtration time was quicker than the allowable limit. Because of this filtration, Castrol Dual Range HV provides better lubrication protection for pumps and cylinders and helps to avoid dramatic pressure surges that could blow seals or split hoses.

Thermal Stability

Thermal stability refers to an oil’s ability to withstand breakdown during periods of high operating temperatures. Oils that are not thermally stable experience breakdown, which leads to damaged metal parts and oxidation of the oil. Castrol Dual Range HV maintains its chemical stability during high temperatures and protects critical hydraulic parts from wear.

Oxidation Control

Oxidation is a degenerative process that is accelerated by a combination of air, catalyzing metals and heat that culminates in excessive oil thickening which leads to the formation of sludge and corrosive acids. The by-products of oxidation cause pumpability problems, compromised wear protection and eventual downtime. Castrol Dual Range HV easily surpasses industry test limits for oxidation control in the Turbine Oil Oxidation Test (D 943). Exceeding limits in this test proves that Castrol Dual Range HV resists the formation of sludge and protects against wear on iron and copper components.