Final Draft
International Standard
ISO/FDIS 4407
Hydraulic fluid power — Fluid contamination — Determination of particulate contamination by the counting method using an optical microscope
Reference number
ISO/FDIS 4407
Edition 3
© ISO 2025
Final Draft International Standard
Under development
This draft is in the approval phase.
Will replace ISO 4407:2002

Abstract

This International Standard specifies methods for determining the level of particulate contamination in liquids used in hydraulic systems by counting the number of particles deposited on the surface of a membrane filter using an optical microscope. It includes particle counting by two manual methods and image analysis, using either transmitted or incident lighting systems.

Particle sizes greater than or equal to 2 micrometres can be sized and counted by this method, but the resolution and accuracy of the results will depend upon the optical system used and the capabilities of the operator.

All hydraulic fluids with a wide range of contamination levels can be analysed according to this International Standard. However, the counting uncertainty at the larger particle sizes increases if the volume filtered is reduced to allow smaller sized particles to be counted, where a fine precipitate or a high particle concentration is present.

General information

  • Status
     : Under development
    Stage
    : Final text received or FDIS registered for formal approval [50.00]
  • Edition
     : 3
  • Technical Committee :
    ISO/TC 131/SC 6
    ICS :
    23.100.60 
  • RSS updates

Life cycle

Sustainable Development Goals

This standard contributes to the following Sustainable Development Goal

9
Industry, Innovation and Infrastructure

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