ISO 26422:2014 PDF

Scope: This International Standard specifies a method of determining the shear stability of polymer-containing lubricating oils by the four-ball machine as specified in ISO 20623, but using a tapered roller bearing. The test results allow prediction of the in-service permanent viscosity loss. NOTE Other International Standards exist which evaluate viscosity loss of polymer-containing oils. The method specified within this International Standard subjects fluids to a higher shear rate than, for example, the diesel injector nozzle shear test described within ISO 20844.[3] It is particularly appropriate for lubricants being used in high shear applications, such as components with gears and roller bearings. In such applications, the shear rate in the ISO 20844 test method can be too low to generate a realistic permanent loss in viscosity of the fluid.

ISO 26422:2014 Referenced Document

DIN 51350-6:1996 Testing of lubricants - Testing in the Shell four-ball tester - Part 6: Determination of shear stability of lubricating oils containing polymers
ISO 20623:2003 Petroleum and related products - Determination of the extreme-pressure and anti-wear properties of fluids - Four ball method (European conditions)
ISO 20844:2004 Petroleum and related products - Determination of the shear stability of polymer-containing oils using a diesel injector nozzle
ISO 3104:1994 Petroleum products - Transparent and opaque liquids - Determination of kinematic viscosity and calculation of dynamic viscosity
ISO 3105:1994 Glass capillary kinematic viscometers - Specifications and operating instructions
ISO 355:2007 Rolling bearings - Tapered roller bearings - Boundary dimensions and series designations
ISO 4259:2006 Petroleum products - Determination and application of precision data in relation to methods of test

2014 ISO 26422:2014 Petroleum and related products - Determination of shear stability of lubricating oils containing polymers - Method using a tapered roller bearing
2011 ISO 26422:2011 Petroleum and related products - Determination of shear stability of lubricating oils containing polymers - Method using a tapered roller bearing