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