M00001549
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ISO 20844 2nd Edition, September 1, 2015 Petroleum and related products - Determination of the shear stability of polymer-containing oils using a diesel injector nozzle
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Availability date: 07/13/2021
Description / Abstract:
This International Standard specifies a method to assess the
resistance to shear stresses applied to mineral oils, synthetic
oils, and other fluids containing polymers, when passed through a
specified diesel injector nozzle. The shear stability is measured
by the change in viscosity of the fluid under test, brought about
by the polymer degradation during stress. Under normal
circumstances, this International Standard is applied to hydraulic
fluids of categories HR and HV as defined in ISO 6743-4[1] and
specified in ISO 11158 [2], but it may also be applied to
fire-resistant hydraulic fluids within categories HFA, HFB, HFC,
and HFD, with modified conditions as specified in ISO 12922[3].
No formal correlation has been established between the viscosity
loss, or the absence of viscosity loss, obtained using the
procedures described in this International Standard and that of
oils and fluids in actual service. However, it provides
standardized conditions for the evaluation of polymer stability
under minimized thermal and oxidative stresses. It is normally used
by manufacturers of fluids and additives, and users, as a means of
ranking existing and potential formulations.
NOTE Changes to properties other than viscosity are specified in
some specifications, but these are not covered by the procedures
specified in this International Standard.