ASTM F312 – Microscopic Sizing and Counting Particles of Aerospace Fluids on Membrane Filters
Aerospace turbine and hydraulic fluids are essential to proper functioning of an aircraft. Particles in these fluids may clog filters and cause wear of system components. When significant numbers of particles are detected, it is may be desirable to visually examine the particles to aid in determining the source. This method determines the number and size of particles in aerospace fluids using visual microscopy.
The sample is filtered and the filter paper is examined under a microscope. There are two reporting options for this test. Method A reports the number of particles in size categories based on their area and Method B reports the number of particles in size categories based on their longest dimension. There are 5 size categories: 5µ to 15µ, 16µ to 25µ, 26µ to 50µ, 51µ to 100µ and over 100µ. When requesting this test, please specify Method A or Method B.
Sample size: 1 qt
- ASTM D4898 – Gravimetric Analysis by Filtration
- ASTM D6786 – Particle Count using Automatic Optical Particle Counters
- FTM-3009 – Particulate Contamination, Filtration Time
- FTM-3012 – Particulate Contamination by HIAC
- FTM-3013 – Particulate Contamination: Gravimetric
- FTM-3101 – Precipitation Number
- ISO 4406 – Particulate Contamination, by HIAC Particle Counter, ISO Cleanliness Code
- NAS1638 – Particulate Contamination by HIAC
- SAE 749 – Particulate Contamination
- SAE ARP 598B – Particle Count
- WQTM-611 – Particle Count, BASF Method