Hydraulic Fluid Testing

Hydraulic fluid testing is essential for maintaining hydraulic systems and ensuring optimal performance. Testing hydraulic fluid can reveal oxidation, wear and contamination from moisture, particles, and metals. By testing hydraulic fluids on a regular basis, potential problems can be detected quickly, allowing preventive maintenance to be performed in a timely manner. Furthermore, it allows comparison of the performance properties of hydraulic fluids including testing for bio-based fluids. Bio-based hydraulic fluids offer many benefits over traditional fluids, such as improved biodegradability and reduced environmental impact. Therefore, it is important to test these materials regularly in order to ensure they are performing efficiently in your system. Regular hydraulic fluid testing can help reduce downtime costs and improve safety by detecting issues before they become more serious problems

ASTM International Method

ASTM D92    Flash Point, Cleveland Open Cup
ASTM D130  Copper Strip Corrosion
ASTM D445  Kinematic Viscosity, 40°C or 100°C
ASTM D445  Kinematic Viscosity, Below 0°C 
ASTM D445  Kinematic Viscosity, 0°C and Above
ASTM D664  Acid Number
ASTM D665  Rust Prevention 4 and 24 Hours
ASTM D892  Foaming, Sequence I - III
ASTM D943  Oxidation Characteristics (2.0 TAN or 1000 Hrs)
ASTM D1401 Emulsion Characteristics / Water Separability
ASTM D2070 Thermal Stability (Hydraulic Fluids)
ASTM D2112 Oxidation Stability of Inhibited Oil
ASTM D2272 Rotating Pressure Vessel Oxidation (RPVOT)
ASTM D2619 Hydrolytic Stability
ASTM D2670 Falex Pin & Vee Wear
ASTM D2983 Brookfield Viscosity, +20°C to -60°C
ASTM D3427 Air Release / Gas Bubble Separation
ASTM D4172 Four Ball Wear
ASTM D5185 Elemental Analysis by ICP
ASTM D5621 Sonic Shear, Hydraulic Fluids
ASTM D6304 Water by Karl Fischer
ASTM D7624 FTIR Analysis, In-Service Fluid, Nitration
ISO 4406 Particle Count