FED-STD-791D
Method 3009.3
September 30, 1986
SOLID-PARTICLE CONTAMINATION IN HYDRAULIC FLUIDS
1. SCOPE
1.1 This method is used for determining the amount of solid particle contamination in
hydraulic fluids.
2. SUMMARY
2.2 The method consists of determining the length of time required to filter the hydraulic
fluid through a single membrane filter, and then examining the filter under a microscope to
determine the number and sizes of solid particles.
3. SAMPLE SIZE
3.1 Approximately 100 mL of hydraulic fluid to be tested.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Microscope, mechanical stage, 100X and 45X magnifications, with micrometer
eyepiece calibrated (for both magnifications) against a suitably ruled, stage micrometer.
4.2 Filter holder, Pyrex (Millipore Corporation, Bedford, Mass. 01730, No.
XX10-047-00; also Gelman Instrument Co., 600 S. Wagner Road, Ann Arbor, MI, No.
1200WP).
a. Fritted-glass base and rubber stopper (No. XX10-047-02).
b. Holding clamp, spring action (No. XX10-047-03).
c. Funnel, graduated, 250 mL (No. XX10-047-04).
4.3 Cover, plastic (for graduated funnel) equipped with membrane filter to minimize
contamination of test filter by air.
4.4 Flask, filter, side-tube (to accommodate filter holder, par. 4.2.2), 1000 mL.
4.5 Vacuum source, 36 to 43 cm (14 to 17 in) of mercury.
4.6 Slides (4), glass 5.0
7.5 cm (2
3 in).
4.7 Bottles (3), sample, with ground-glass stoppers, 1000 mL.
4.8 Forceps, stainless-steel, plastic tipped.
4.9 Petri dish, with cover (for four 5.0
7.5 cm glass slides).
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