Skip to main content

ISO 20844:2004

Withdrawn Date published:

Warning: Withdrawn Standard. This document has been replaced by:

Petroleum and related products — Determination of the shear stability of polymer-containing oils using a diesel injector nozzle

ISO 20844:2004 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, ISO 20844:2004 is applied to hydraulic fluids of categories HR and HV as defined in ISO 6743-4 and specified in ISO 11158, 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.

No formal correlation has been established between the viscosity loss, or the absence of viscosity loss, obtained using the procedures described in ISO 20844:2004 and that of oils and fluids in actual service. However, ISO 20844:2004 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.

Changes to properties other than viscosity are specified in some specifications, but these are not covered by the procedures specified in ISO 20844:2004.

Get this standard Prices exclude GST
PDF ( Single user document)
$91.24 NZD
HardCopy
$91.24 NZD
Networkable PDF
Price varies
Preview only close
Prev {{ page }}/ {{ numPages }} Next
Preview only close
Prev {{ page }}/ {{ numPages }} Next
Pages: 9

Keep me up-to-date

Sign up to receive updates when there are changes to this standard

Related Information

Similar Standards

  • AS/NZS 2106.1:1999

    Methods for the determination of the flash point of flammable liquids (closed cup) - Abel closed cup method

  • AS/NZS 4502.1:2006

    Methods for evaluating clothing for protection against heat and fire - Evaluation of thermal behaviour of materials and material assemblies when exposed to a source of radiant heat

  • BS 2000-0-1:1999

    Methods of test for petroleum and its products. General introduction, Specifications. IP Standard thermometers, Section 0.1: Specifications - IP standard for thermometers

  • BS 2000-0-2:1996

    Methods of test for petroleum and its products. General introduction, Specifications for IP standard reference liquids

Preview only close
Prev {{ page }}/ {{ numPages }} Next
Preview only close
Prev {{ page }}/ {{ numPages }} Next
Pages: 9

ISO 20844:2004

Get this standard Prices exclude GST
PDF ( Single user document)
$91.24 NZD
HardCopy
$91.24 NZD
Networkable PDF
Price varies

Request to add this standard to your subscription

ISO 20844:2004

Price varies
Online library subscription

Click "Send request for subscription" to request for your Account Administrator to add this standard to your subscripiton.

Cancel