HYDRAULIC SYSTEM OIL ISO 32 based mineral base oils have different viscosities mineral oils (i.e. SN 100, SN 150 and SN 500), rust and oxidation inhibitor additives,viscosity index improver ( VI ), pour point disperssant ( PPD ), antifoam agent.
Sometimes, depending on properties of hydraulic system oil 32 include corrosion and oxidation inhibitor and metal passivator and etc.
ISO 32
HYDRAULIC SYSTEM FLUID
PROPERTIES
When choosing a hydraulic fluid, consider the following characteristics: viscosity, viscosity index, oxidation stability and wear resistance. These characteristics will determine how your fluid operates within your system. Fluid property testing is done in accordance with either American Society of Testing and Materials (ASTM) or other recognized standards organizations.
1. Viscosity is the measure of a fluid’s resistance to flow and shear. A fluid of higher viscosity will flow with higher resistance compared to a fluid with a low viscosity. Excessively high viscosity can contribute to high fluid temperature and greater energy consumption. Viscosity that is too high or too low can damage a system, and consequently, is the key factor when considering a hydraulic fluid.
2. Viscosity Index is how the viscosity of a fluid changes with a change in temperature. A high VI fluid will maintain its viscosity over a broader temperature range than a low VI fluid of the same weight. High VI fluids are used where temperature extremes are expected. This is particularly important for hydraulic systems that operate outdoors.
3. Oxidation Stability is the fluid’s resistance to heat-induced degradation caused by a chemical reaction with oxygen. Oxidation greatly reduces the life of a fluid, leaving by-products such as sludge and varnish. Varnish interferes with valve functioning and can restrict flow passageways.
4. Wear Resistance is the lubricant’s ability to reduce the wear rate in frictional boundary contacts. This is achieved when the fluid forms a protective film on metal surfaces to prevent abrasion, scuffing and contact fatigue on component surfaces.
HYDRAULIC SYSTEM OILS
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