MIL-PRF-87260B(USAF)
4.5.14 Entrained solid contamination tests.
Solid contamination tests shall be conducted on a hot-wire-cut cylindrical specimen having
dimensions of 9.25 inches in diameter and 8 inches in height. The 8-inch dimension shall be
cut in the direction of rise (bun height). For material having more than 8 inches in bun height,
the specimen shall be taken from the lower portion of the test section. Testing shall be
conducted using a U.S. Testing Company model 6523 dry cleaning machine or equivalent,
having a tumbler rotation speed of 45 revolutions per minute (rpm). The specimen shall be
positioned in the center of the tumbler. The test cycle shall be 5 minutes using a 4-liter charge
of Type I fluid conforming to SAE AMS-2629 which has been pre-filtered through a 0.8-micron
Millipore Filter Corporation filter, or equivalent. Upon completion of the test cycle, the specimen
shall be positioned slightly above the fluid level and allowed to drain for 5 minutes prior to
removal. The test fluid shall then be tested for level of solid contamination in accordance with
ASTM D2276, Appendix A3 (laboratory filtration) or T.O. 42B-1-1, sections 5-23, 5-24, and 5-47
through 5-52. Following filtration of the test fluid and just prior to removal of the filter pad from
the apparatus, the filter and contamination shall be neutralized of static charge with an Amstat
Industries Model 2U500 air deionizer, or equivalent (see 6.10). This step reduces the loss of
particles from the filter pad during transfer to the drying oven. Each filter used shall be dried at
200 ±5°F for a minimum of 15 minutes and then cooled for a minimum of 15 minutes. A
minimum of one control filter shall be run for each set of samples. Test results shall be reported
in milligrams per cubic foot of material.
4.5.15 Steam autoclave exposure test.
Testing shall be conducted in accordance with ASTM D3574 (Test J) steam autoclave test for
10 hours at 250 ±5°F. Tension tests as specified in 4.5.5 shall be conducted on five control
specimens and five exposed specimens. Prior to testing, exposed specimens shall be post-
dried for 30 minutes at 160 ±5°F and then cooled at room temperature for 30 minutes. The
results for tensile strength and elongation shall be reported before and after exposure and the
average percent change in tensile strength calculated.
4.5.16 Fluid immersion tests.
Fluid exposure tests shall be conducted on the baffle material under the following exposure
conditions:
a. Grade JP-8 turbine fuel conforming to MIL-DTL-83133 for 12 weeks at 160 ±5°F.
exposed to the test environment.
b. Grade JP-8 turbine fuel conforming to MIL-DTL-83133 for 4 weeks at 72 ±5°F. To
determine the wet property values for the material, tension, CLD, and tear resistance
and then tested fuel-wetted for all properties.
4.5.16.1 Tension tests.
Tests in accordance with 4.5.16a shall be conducted in loosely capped standard quart jars
using approximately 900 ±25 ml of fluid for each nine specimens for each sampling frequency.
Specimens shall be taken from the upper half of the test section as specified in 4.5.5. The
testing frequency for each condition shall be every 4 weeks. The JP-8 fuel shall be changed at
each 4-week interval. Testing shall include three specimens dry tension-tested as specified in
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