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Significance and Use
5.1 The purpose of this practice is to establish viscosity designations derived from viscosities measured by test methods which have a meaningful relationship to hydraulic fluid performance. This permits lubricant suppliers, lubricant users, and equipment designers to have a uniform and common basis for designating, specifying, or selecting the viscosity characteristics of hydraulic fluids.
5.2 This practice is not intended to be a replacement for Classification D2422. Rather, it is an enhancement intended to provide a better description of the viscosity characteristics of lubricants used as hydraulic fluids.
5.4 While it is not intended for other functional fluids, this practice may be useful in high-shear-stress applications where viscosity index (VI) improvers are used to extend the useful operating temperature range of the fluid.
5.5 This practice does not apply to other lubricants for which viscosity classification systems already exist, for example, SAE J300 for automotive engine oils and SAE J306 for axle and manual transmission lubricants.
1.2 For determination of viscosities at low temperature, this practice uses millipascal·second (mPa·s) as the unit of viscosity. For reference, 1 mPa·s is equivalent to 1 centipoise (cP). For determination of viscosities at high temperature, this practice uses millimetre squared per second (mm2/s) as the unit of kinematic viscosity. For reference, 1 mm2/s is equivalent to 1 centistoke (cSt).
1.3 This practice is applicable to fluids ranging in kinematic viscosity from about 4 to 150 mm2/s as measured at a reference temperature of 40°C and to temperatures from −50 to +16°C for a fluid viscosity of 750 mPa·s.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D445 Test Method for Kinematic Viscosity of Transparent and Opaque Liquids (and Calculation of Dynamic Viscosity)
D2270 Practice for Calculating Viscosity Index from Kinematic Viscosity at 40 and 100C
D2422 Classification of Industrial Fluid Lubricants by Viscosity System
D2983 Test Method for Low-Temperature Viscosity of Lubricants Measured by Brookfield Viscometer
D5621 Test Method for Sonic Shear Stability of Hydraulic Fluids
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
Society of Automotive Engineers (SAE) StandardsJ300 Engine Oil Viscosity Classification J306 Axle and Manual Transmission Lubricant Viscosity Classification
ICS Number Code 75.120 (Hydraulic fluids)
UNSPSC Code 15121504(Hydraulic oil)
ASTM D6080-12a, Standard Practice for Defining the Viscosity Characteristics of Hydraulic Fluids, ASTM International, West Conshohocken, PA, 2012, www.astm.orgBack to Top