FED-STD-791D
Method 3010.1
September 30, 1986
SOLID PARTICLE CONTAMINATION IN AIRCRAFT
TURBINE ENGINE LUBRICANTS (GRAVIMETRIC PROCEDURE)
1. SCOPE
1.1 This method describes a gravimetric procedure for the determination of solid particle
contamination in packaged aircraft turbine lubricants and related fluids.
2. SUMMARY
2.1 A known volume of fluid is filtered through a pre-weighed membrane filter. The
increase in filter weight is determined after washing and drying and reported as total
contaminant. The test filter is ashed and the inorganic material remaining is reported as ash.
3. SAMPLE SIZE
3.1 Approximately 1 L (1 qt) of turbine engine lubricant.
3.2 The sample must be thoroughly representative of the material to be tested. This
requires vigorous agitation of the fluid before sampling. The importance of sampling cannot be
too strongly emphasized. All suspected sediment must be homogeneously suspended in the oil.
When packaged liter (quart) samples are available the entire liter (quart) should be used.
4. REFERENCES, STANDARDS, AND APPARATUS
4.1 Membrane filters, white, plain, 4.7-cm diameter, pore sizes 1.2 and 0.22 m.
4.2 Filter holder, 4.7 cm.
4.3 Analytical balance, sensitivity 0.1 mg.
4.4 Petri dishes, 5.0 cm in diameter.
4.5 Oven, non-circulatory air, capable of maintaining a temperature of 90C (200F)
4.6 Forceps, flat-bladed with unserrated tips.
4.7 Vacuum system.
Muffle furnace capable of maintaining a temperature of 810C (1500F). 4.9 Crucibles,
30-mL capacity, squat form.
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