Aerospace Fluid Power - Contamination Classification for Hydraulic Fluids

Standard:
Revised:
  • 2013-09-27
 
  • CURRENT
Publisher:
  • SAE International
Pages:
10
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 added to describe the contamination levels of the fluid at the specified particle size ranges.

Rationale:

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 ISO 4402 were removed.

History:
Standard Published Revision Status
AS4059F 2013-09-27 Latest Revised
2011-03-18 Historical Reaffirmed
2001-04-01 Historical Revised
2000-08-01 Historical Revised
1995-03-01 Historical Revised
1990-03-30 Historical Revised
1988-06-14 Historical Issued
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