MIL-DTL-13486E
4.7.4.7 Oil absorption. The specimen shall be suspended for 20 hours in the test liquid with not less
than 1-1/2 inches, nor more than 2 inches of each specimen end protruding above the surface of the
liquid. The test liquid temperature shall be maintained at not less than 158 °F or more than 165 °F during
the test. Before immersion, the diameter of the cable shall be measured at five or more approximately
equally spaced locations along the length. This shall include measurements in two perpendicular
directions. At the conclusion of the immersion period, the specimen shall be removed from the test liquid,
allowed to cool to room temperature, and then be wiped dry with a clean, soft, absorbent, dry cloth. The
test specimen shall then be remeasured at the same locations at which the pre-immersion measurements
were taken and the percent increase in diameter computed.
4.7.4.7.1 Immersion test apparatus. The immersion test apparatus shall include a bath of adequate
dimensions to hold the test specimen, with means for maintaining the test liquid at the specified
temperature throughout the test.
4.7.4.7.2 Test liquid. The test liquid shall be a petroleum base oil (see 6.7) with the following
properties as determined by the methods indicated below and specified in FED-STD-791:
a. Viscosity, Saybolt Universal (method 304) 155±5 seconds (measured at 100 °F).
b. Aniline point, (method 3601) 157.1±1.8 °F.
c. Flash point, (method 1103) 330±5 °F.
4.7.4.8 Liquid immersion. Each of three specimens shall be tested using a different one of the
liquids specified in 3.5.9. The immersion test apparatus shall be used. Items such as the sheath, filling
compound, tape, or wrap shall be removed from a distance of 1-1/2 inches from each end of the
specimen to expose the insulated conductors. The specimen shall be immersed for 20 hours in the liquid
with no less than 1-1/2 inches and no more than 2 inches of each end protruding above the surface of the
liquid. At the end of the 20-hour period, the specimen shall be removed from the liquid and its surface
wiped dry with a clean, soft, absorbent, dry cloth. The specimen shall be examined for evidence of
damage.
4.7.4.8.1 Subsequent testing. When the specimen which has been immersed in salt water in
accordance with 4.7.4.8 is subsequently subjected to the test specified in 4.7.4.2, the 5-hour immersion
specified therein may be omitted.
4.7.4.9 Flammability. The specimen shall be tested using the flammability test apparatus. The
specimen shall be suspended taut in a horizontal position as shown on figure 1, within a partial enclosure
which allows a flow of air sufficient for complete combustion but which is free from drafts. (If the
specimen is type II cable with external shielding, this shielding shall be removed.) A test area shall be
marked in the center of the suspended cable as shown on figure 1. The gas flame specified on figure 1
shall be applied, as shown, to the test area so that the flame is the same distance from either edge of the
test area. The flame shall be applied for 30 seconds if the cable specimen has a nominal diameter equal
to or less than .5 inch (12.7 mm), and 45 seconds if the cable has a larger nominal diameter. The cable
shall be observed for evidence of burning particles falling from the cable. The time required for the flame
to reach one of the edges of the test area shall be measured. The rate of travel in inches per minute shall
be recorded. The time required for the cable to cease flaming after the gas flame has been withdrawn
shall be recorded.
4.7.4.9.1 Flammability test apparatus. The flammability test apparatus shall include a Bunsen burner
equipped with a wing-top flame spreader having an opening not less than 1/16 inch wide and 2 inches
(50.8 mm) long.
16
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business