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  • BSI
    BS EN ISO 20844:2015 Petroleum and related products. Determination of the shear stability of polymer-containing oils using a diesel injector nozzle
    Edition: 2017
    $313.97
    / user per year

Description of BS EN ISO 20844:2015 2017

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.



Standard NumberBS EN ISO 20844:2015
TitlePetroleum and related products. Determination of the shear stability of polymer-containing oils using a diesel injector nozzle
StatusConfirmed
Publication Date2017-07-11
ReplacesBS EN ISO 20844:2004
Identical National Standard OfEN ISO 20844:2015, ISO 20844:2015
DescriptorsPolymers, Oils, Synthetic oil, Mineral oils, Hydraulic fluids, Petroleum technology, Petroleum products, Petroleum, Viscosity measurement, Flow nozzles, Fuel injectors, Diesel fuels, Shear testing, Shear stress, Fluids
ICS75.080 Petroleum products in general
CommitteeMCE/18/-/16
ISBN978 0 580 84329 7
PublisherBSI
Pages18

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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