SAE AS4059F-2013
Aerospace Fluid Power - Contamination Classification for Hydraulic Fluids

Standard No.

SAE AS4059F-2013

Release Date

2013

Published By

Society of Automotive Engineers (SAE)

Status

Be replaced

Replace By

SAE AS4059F-2020

Latest

SAE AS4059G-2022

Scope

This SAE Aerospace Standard (AS) defines contamination classes and levels for particulate contamination of hydraulic fluids and includes methods of reporting related data (Appendix A). The contamination levels selected are based on the widely accepted NAS 1638 cleanliness classes. The conversion from NAS 1638 cleanliness class specifications to AS4059 class specifications is defined. The comparison of the NAS 1638 classes to AS4059 classes and levels is provided and are defined and the differences explained (Appendix B). NAS 1638 classes based on weight of particles are not applicable to these classes and are not included. A contamination code has been adde

SAE AS4059F-2013 Referenced Document

• ISO 11171:2010 Hydraulic fluid power - Calibration of automatic particle counters for liquids
• ISO 11500:2008 Hydraulic fluid power - Determination of the particulate contamination level of a liquid sample by automatic particle counting using the light-extinction principle
• ISO 4402:1991 Hydraulic fluid power; calibration of automatic-count instruments for particles suspended in liquids; method using classified AC fine test dust contaminant
• ISO 4407:2002 Hydraulic fluid power - Fluid contamination - Determination of particulate contamination by the counting method using an optical microscope

SAE AS4059F-2013 history

• 2022 SAE AS4059G-2022 Contamination Classification for Hydraulic Fluids
• 2020 SAE AS4059F-2020 Aerospace Fluid Power - Contamination Classification for Hydraulic Fluids
• 2013 SAE AS4059F-2013 Aerospace Fluid Power - Contamination Classification for Hydraulic Fluids
• 2011 SAE AS4059E-2011 Aerospace Fluid Power - Cleanliness Classification for Hydraulic Fluids
• 2005 SAE AS4059E-2005 (R) Aerospace Fluid Power - Cleanliness Classification for Hydraulic Fluids
• 2001 SAE AS4059D-2001 Aerospace Fluid Power - Cleanliness Classification for Hydraulic Fluids
• 2000 SAE AS4059C-2000 Contamination Classification for Hydraulic Fluids
• 1995 SAE AS4059B-1995 Aerospace-Cleanliness Classification for Hydraulic Fluids
• 1990 SAE AS4059A-1990 AEROSPACE-CLEANLINESS CLASSIFICATION FOR HYDRAULIC FLUIDS
• 1988 SAE AS4059-1988 AEROSPACE-CLEANLINESS CLASSIFICATION FOR HYDRAULIC FLUIDS