It is important to note that when comparing fluid viscosities, fluids being compared must be tested at the same time and at constant temperatures, or the comparison is invalid. To be relevant, the cSt number must be reported along with the temperature at which it was determined. The elapsed time can be directly converted into centistokes (cSt). When the specified temperature is reached, the oil is drawn into a wider area within the viscometer, which is identified by upper and lower marks and allowed to drain out. The test oil is placed in a viscometer and heated by the bath to the specified stable temperature. The temperature of the bath is set at either 104 ° F (40 ° C), which is typical for industrial lubricants like hydraulic fluids, compressor oils or gear lubricants, or 212 ° F (100 ° C), which is typical for motor oils. This test uses a uniformly marked or calibrated tube called a viscometer and a heating bath. KINEMATIC VISCOSITY TEST (ASTM D445) Kinematic viscosity is commonly determined under high temperatures using the American Society for Testing and Materials (ASTM D445) Viscosity Test. Kinematic Viscosity Test (ASTM D445) Procedure
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