1[3]ISO 4406-1987,Hydraulic Fluid Power-Fluids-Method for Coding the Level of Contamination by Solid Particles[S].
2[4]ISO 4402,Hydraulic Fluid Power-Calibration of Automatic-count Instruments for Particles Suspended in LiquidsMethod Using Classified AC Fine Test Dust Contaminant[S].
3[5]ISO 4406-1999,Hydraulic Fluid Power-Fluids-Method for Coding the Level of Contamination by Solid Particles[S].
4[6]ISO 11171,Hydraulic Fluid Power-Calibration of Automatic Particle Counters for Liquids[S].
5[7]NAS 1638,Cleanliness Requirement of Hydraulic Fluid System[S].