AS4059F Aerospace Fluid Power - Contamination Classification for Hydraulic Fluids

Reaffirmed

05/05/2020

Features
Issuing Committee
Scope
Content
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 added to describe the contamination levels of the fluid at the specified particle size ranges.
Rationale
Content
Revision F of this standard has been prepared to include comments received from the international community, principally to simplify the coding system to either a single number contamination class that is the same as the obsolete NAS 1638 class, or as a contamination code indicating the contamination levels at a number of distinct particle size ranges. Also, normative references to using the obsolete calibration procedure ISO4402 were removed.
Meta TagsDetails
DOI
https://doi.org/10.4271/AS4059F
Pages
10
Citation
SAE International Technical Standard, Aerospace Fluid Power - Contamination Classification for Hydraulic Fluids, SAE Standard AS4059F, Reaffirmed May 2020, Revised September 2013, Issued June 1988, https://doi.org/10.4271/AS4059F.
Additional Details
Publisher
Published
May 5, 2020
Product Code
AS4059F
Content Type
Technical Standard
Status
Reaffirmed
Language
English