MIL-DTL-44031E
lamplight at 2856 (+200)°K.
4/
Only the stain on the nylon and cotton fibers of the color transfer cloth shall be evaluated.
5/
Specimens shall be subjected to 15 complete cycles (wash and dry) prior to determinations of
dynamic absorption and resistance to organic liquid after laundering. The last
two (2) wash cycles shall be performed without the addition of detergent.
6/
Immediately after tumble drying the specimens shall be laid out, without tension or
pressing, on a flat surface in standard atmosphere until moisture equilibrium is reached.
7/
The last wash cycle shall be performed without the use of detergent. Specimens shall be
dried after each laundering.
8/
The needle shall measure 0.040 (± 0.001) inch across the blade at the eye. The thread for all
tapes shall be cotton or polyester covered in accordance with A-A-50199 Tex size 36-45, for
the needle and top thread and Tex size 31-35 for the looper.
4.5 Methods of inspection.
4.5.1 Presence of labile sulfur test. In the determination of presence of labile sulfur in textile
materials with lead acetate, two 1.50 (± 0.01) gram samples from each material submitted for
evaluation shall be tested. Each of the two samples shall be cut into very small pieces and placed
into separate test tubes. The samples shall be submersed in a stannous chloride solution that
contains 100 grams of stannous chloride crystals ACS in 100 milliliters of hydrochloric acid
ACS (35 percent concentration) and 50 milliliters of distilled water. A filter paper wet out with a
5.0 percent lead acetate solution shall be placed over the top of the test tube. The lead acetate
solution contains 5.0 grams of lead acetate CP reagent grade and enough distilled water to make
up a 100 milliliter solution; if the solution is not clear add a few drops (one at a time) of glacial
acetic acid until the solution is clear. The test tube containing the textile sample, stannous
chloride and wet filter paper shall be heated over a low flame until the solution is boiling. The
solution should not be heated for more than 15 seconds. A brown to black stain on the filter
paper should be evaluated as follows:
Free
- The filter paper shows no discoloration or staining of any kind.
Slight
- The filter paper shows a light tan to light brown discoloration stain.
Moderate - The filter paper shows a dark brown discoloration stain.
Severe - The filter paper shows a black color stain.
4.5.2 Colorfastness evaluation testing. When testing for colorfastness properties, each color
shall be evaluated, whenever possible, separately and reported as such. In cases where the print
pattern does not allow for the evaluation of each color separately, the test results should indicated
which colors were evaluated together. All color evaluations to include visual, and colorfastness
for Classes 7 and 8 shall be performed on the solid color area and not the tonal area.
4.5.3 Spectral reflectance test. Spectral reflectance data shall be obtained from 600 to 860
nanometers (nm) at 20 nm intervals on a spectrophotometer relative to the barium sulfate
standard, the preferred white standard. Other white reference materials may be used provided
they are calibrated to absolute white, e.g. magnesium oxide or vitrolite tiles. The spectral band
width shall be less than 26 nm at 860 nm. Reflectance measurements shall be made by either the
monochromatic or polychromatic mode of operation. When the polychromatic mode of operation
is used, the spectrophotometer shall operate with the specimen diffusely illuminated with the full
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