![]() ![]() SAE AS4059 is mainly used by the military and companies from the aviation/aerospace and the offshore oil & gas-industry. History and scope: SAE AS4059 was developped to succeed the NAS 1638 standard and to eliminate the existing disadvantages NAS 1638 has, most importantly, the traceability of the used calibration standard. ![]() The calibration media used is called ISO MTD (ISO Medium Test Dust) and it was introduced after the end of production of ACFTD (Air Cleaner Fine Test Dust) which had been previously used to calibrate particle counters according to ISO 4402. 1µm as per ISO 4402 equals approximately to 4µm(c) as per ISO 11171.Ĭalibration: The ISO 4406 reporting standard is based on the calibration standard ISO 11171. This enables the old and new measurements to be easily identified and differentiated. The additional (c) indicates that the particle counter has been calibrated according to ISO 11171. Particle sizes are now displayed as µm(c). To comply with the ISO-standardization process, the particle sizes have been redefined. Particle sizes: The cleanliness classes as per ISO 4406 are determined by the cumulative counts in the size bands >4µm(c), >6µm(c) and >14µm(c). ISO 4406 is predominantly used in the hydraulic industry however companies within the filtration, fuel and automotive industries also adopt this standard. The latest revision is called ISO 4406:2017. History and scope: In 19:1999 replaced the previous standard ISO 4406:1987.
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