Nnsae as 4059 class 6b-f pdf

Sae as 4059 equivalent iso 4406 class based on iso 4406. 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 classes selected are based on the widely accepted nas 1638 cleanliness classes. Few aircraft companies sae as 4059 class 6bf this standard, and very few industrial companies even knew it existed despite the fact that it overcame the deficiencies of nas national aerospace standard nas 1 is a particulate contamination coding system used in the fluid power industry to simplify the commu nication of data from particle counters. Comparison of the nas 1638 classes to as4059 classes is defined and the. Aerospace fluid power cleanliness classification for. Aerospace fluid power contamination classification for. Nas 1638 class 6, can be swapped to as4059 class 6b through f to provide the. The table below shows the number of particles100 ml fluid. The contamination levels selected are based on the widely accepted nas 1638.

Guide to contamination standards 3 contamination basics solid contaminants in fluid systems vary in size, shape, form and quantity. The comparison of the nas 1638 classes to as4059 classes and levels is provided and are defined and the differences explained appendix b. The conversion from nas 1638 cleanliness class specifications to as4059 class specifications is defined. From this basic distribution, a series of 14 classes was created covering very. The figures are differential counts, and the nas class is usually reported as a single figure representing the maximum allowed particle counts i. The most damaging contaminants in hydraulic systems are normally between 6 and 14 microns, and therefore cannot be seen by the naked eye. The contamination classes selected are based on the widely accepted older nas 1638 cleanliness classes. Determing as4059e class using cumulative particle counts. This sae aerospace standard as defines cleanliness classes for particulate. The sae aerospace standard as as4059d defines cleanliness classes for particulate contamination of hydraulic fluids and includes methods of reporting related data. The most common classification methods follow iso 4406 and sae as 4059. The figures are differential counts, and the nas class is usually reported as a single figure representing the. This method is applicable to those using the methods of previous revisions.

Quantifying fluid cleanliness bsf filtertechniek bv. The contamination levels selected are based on the widely accepted nas 1638 cleanliness classes. A class may be designated for each size from a through f. 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.