Browse Standards AS4059E
Historical REAFFIRMED 2011-03-18

Aerospace Fluid Power - Cleanliness Classification for Hydraulic Fluids AS4059E

This SAE Aerospace Standard (AS) defines cleanliness classes for particulate contamination of hydraulic fluids and includes methods of reporting related data (Appendix A). The contamination classes selected are based on the widely accepted NAS 1638 cleanliness classes. Conversion from NAS 1638 cleanliness class specifications to AS4059 class specifications is defined. Comparison of the NAS 1638 classes to AS4059 classes is defined and the differences explained (Appendix B). This document provides versatility in identifying a maximum class in multiple size ranges, total number of particles larger than a specific size or designating a class for each size. NAS 1638 classes based on weight of particles are not applicable to either of these classes and are not included.
AS4059F
2020-05-05
Latest
Reaffirmed
AS4059E
2011-03-18
Historical
Reaffirmed
AS4059D
2001-04-01
Historical
Revised
AS4059C
2000-08-01
Historical
Revised
AS4059B
1995-03-01
Historical
Revised
AS4059A
1990-03-30
Historical
Revised
AS4059
1988-06-14
Historical
Issued

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