NAS1638: Particulate Contamination by HIAC

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NAS 1638 – Cleanliness Requirements of Parts Used in Hydraulic Systems

Systems in airplanes and large helicopters including rotors, wing flaps, passenger entry stairs and nose gear steering systems are usually powered by hydraulic systems.  Particles in hydraulic fluids may decrease system efficiency – small particles may cause silting, clog filters and generate excessive heat.  Larger particles may cause wear of system components.  NAS 1638 is a system that assigns a cleanliness rating to hydraulic fluids.  The system is based on a scale from 00 to 12 with 00 being a very clean fluid, and 12 being a highly contaminated one. 

To determine the NAS 1638 rating, an automatic optical particle counter is used to determine the number of particles per 100 ml sample in 5 size classes:  5µ to 15µ, 15µ to 25µ, 25µ to 50µ, 50µ to 100µ and >100µ.   Using this data an NAS class number is assigned.  Reported is the number of particles in each size category and the NAS 1638 Class number.  

           

 

Price: $193.00

Sample size: 1 pt

Related tests:

Petro-Lubricant Testing Laboratories, Inc.
116 Sunset Inn Road, Lafayette, NJ 07848, USA
Phone: +1 973-579-3448

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