Because there are surface tension or kinematic viscosity differences, or both, between the primary standard (7.4) and kinematic viscosity standards (7.5), special procedures using master viscometers are required to “step-up” from the kinematic viscosity of the primary standard to the kinematic viscosities of oil standards.

Using master viscometers calibrated according to this practice, an operator can calibrate kinematic viscometers in accordance with Specifications D 446.

Using viscosity oil standards established in this practice, an operator can calibrate kinematic viscometers in accordance with Specifications D 446.

1.1 This practice covers the calibration of master viscometers and viscosity oil standards, both of which may be used to calibrate routine viscometers as described in Test Method D 445 and Specifications D 446 over the temperature range from 15 to 100°C.

1.2 The calibration constants in mm²/s ² are to be regarded as the standard. The kinematic viscosities in mm ²/s are to be regarded as the standard.

This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific warning statements, see Section 7.