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Savant Labs
A World of Lubrication Understanding®

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 D93     Flash Point, Pensky-Martins Closed Cup
ASTM D97     Pour Point
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 D972  Evaporation Loss (Grease)
ASTM D974  Acid Number
ASTM D1298 Density / API Gravity, Hydrometer
ASTM D1401 Emulsion Characteristics / Water Separability
ASTM D1500 Color
ASTM D2070 Thermal Stability (Hydraulic Fluids)
ASTM D2112 Oxidation Stability of Inhibited Oil
ASTM D2270 Viscosity Index (Includes D445 at 40°C and 100°C)
ASTM D2272 Rotating Pressure Vessel Oxidation (RPVOT)
ASTM D2532 Viscosity Stability at Low Temperature
ASTM D2603 Sonic Shear, Oils
ASTM D2619 Hydrolytic Stability
ASTM D2670 Falex Pin & Vee Wear
ASTM D2896 Base Number
ASTM D2983 Brookfield Viscosity, +20°C to -60°C
ASTM D3427 Air Release / Gas Bubble Separation
ASTM D4052 Specific Gravity (Includes API Gravity)
ASTM D4172 Four-Ball Wear
ASTM D4289 Elastomer Compatibility
ASTM D4310 Sludging & Corrosion Tendency Up to 1000 Hours
ASTM D4683 High-Temperature High Shear / TBS Viscosity, 150°C
ASTM D4739 Base Number
ASTM D4951 Elemental Analysis by Inductively Coupled Plasma, Wear Metals
ASTM D5133 Scanning Brookfield Viscosity
ASTM D5182 FZG Gear Test 
ASTM D5185 Elemental Analysis by ICP
ASTM D5621 Sonic Shear, Hydraulic Fluids
ASTM D6130 Elemental Analysis by ICP, Aqueous/Coolants/Sulfur
ASTM D6304 Water by Karl Fischer
ASTM D6417 Simulated Distillation by Gas Chromatography
ASTM D6616 High-Temperature High Shear / TBS Viscosity, 100°C
ASTM D6793 Bulk Modulus, Up to 80°C
ASTM D7214 FTIR Analysis, Oxidation by Peak Area Increase
ASTM D7216 Elastomer Compatibility
ASTM D7624 FTIR Analysis, In-Service Fluid, Nitration
CEC L-45-99 KRL Shear Loss
CEC L-112-16 Elastomer Compatibility
FTM 3465 Channeling Characteristics
ISO 4406 Particle Count
ISO 6072 Elastomer Compatibility, Hydraulic Fluid, 1000 Hours
SAVLAB TBR High-Temperature Low Shear / TBR Viscosity
SAVLAB LPYC Density, Pycnometer