MIL-DTL-11751G
4.5.12.3 at the 589 nm sodium line and at a wavelength of 580 nm. The difference between the
intensities observed for the specimen solution at 580 nm and 589 nm shall not exceed the
difference observed at 589 nm between the specimen solution and the control solution.
4.5.13 Foam. A 250 mL quantity of potassium hydroxide solution shall be transferred to
a clean, clear, one-half to one-liter container. The container shall be capped and vigorously
shaken by hand for 15 seconds, then allowed to stand undisturbed for 5 minutes. There shall be
no visible evidence of foam.
4.5.14 Particulate. A 250 mL quantity of potassium hydroxide solution shall be visually
examined for clarity and solids in a clean, clear container against a white and black background.
The inspection shall be performed by a person with normal visual acuity, natural or corrected,
under bright light of not less than 1100 lux (100 foot-candles). A general purpose two-D-cell
flashlight with fresh batteries and lamp, positioned 45 centimeters (18 inches) perpendicular to a
surface shall illuminate that surface with an intensity of not less than 1100 lux (100 foot-
candles). There shall be no visible evidence of particulates, fiber, oil, or grease.
4.5.15 Filterable non-volatile residue (NVR).
4.5.15.1 Balance. The balance shall be accurate to 0.1 mg with a zero drift less than
0.1 mg.
4.5.15.2 Membrane filter. The membrane filter shall be disposable and shall be
constructed of pure TeflonŽ or equal. The membrane filter shall be 47 millimeter in diameter
and shall have a pore size of 0.45 or 0.50 micrometer. Bonded or laminated membrane filters
shall not be used.
4.5.15.3 Procedure. Weigh a clean, unused, membrane filter to the nearest 0.1 mg.
Transfer the membrane filter to a clean filter holder with reservoir. Wet the filter with 1 or 2
drops of isopropyl alcohol. Allow at least 15 seconds for the isopropyl alcohol to fully wet the
filter. This is observable as a change in filter color from opaque white when dry to translucent
when wet. Filter 10 to 20 mL of deionized water through the filter. Filter 200 mL of potassium
hydroxide solution through the filter. Do not exceed a filtration rate of 50 mL per minute. Filter
100 to 110 mL of deionized water through the filter. Do not exceed a filtration rate of 50 mL per
minute. Remove the filter, place in a clean dish with cover. Dry the filter with dish cover ajar in
an oven at 55 °C to 60 °C (131 °F to 140 °F) for 20 to 30 minutes. Remove the dish with filter
from the oven, transfer to an ambient temperature dish and allow it to cool with cover ajar for at
least 2 minutes. Weigh the filter to the nearest 0.1 mg. Calculate the potassium hydroxide
solution filterable non-volatile residue as follows:
Potassium hydroxide solution filterable NVR = 5 x (B-A)
where: A = Initial weight of the filter in milligrams.
B = Final weight of the filter in milligrams.
8
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business