MIL-DTL-44419A
leather from which the discarded specimen was obtained. The new specimen shall be tested for
stiffness before and after soaking. The test results obtained when the discarded specimen was
tested for stiffness before soaking shall not be reported.
4.5.2 Water absorption resistance test. One 3-inch diameter specimen shall be tested from
each 12 x 12 inch test area. Prior to testing, the specimen shall be allowed to reach moisture
equilibrium in the standard conditions environment. A stainless steel 500 mL, 3-inch diameter,
5-inch long container with a rubber gasket and cover shall be used to test the specimen. The
specimen shall first be weighed (to the nearest 0.01 g) and then shall be placed inside the cover
with the flesh side of the specimen next to the inside of the cover. Place the rubber gasket inside
the cover and against the grain surface of the leather specimen. Add 100 mL of distilled or
deionized water at 23 °C to the container. Secure the cover with the specimen and gasket to the
container. Invert the container so the water is against the grain surface of the specimen. Place the
inverted container on a flat surface and allow it to remain in the inverted position for 30 minutes.
At the end of 30 minutes place the container upright, remove the cover, and place it on a flat
surface. The inside of the cover shall face the flat surface. Tilt the cover so the outer edge of the
bottom is raised 1-1.5 inches from the flat surface, and allow it to drain for 5 minutes. After
5 minutes immediately remove the specimen from the cover, hold the specimen by its edge and
shake briskly once to remove any free moisture from the surface of the specimen. Immediately re-
weigh the specimen to the nearest 0.01 g, and calculate the percent water absorption as follows:
Percent water absorption =
(W 2- W 1) x 100
W1
W1 = Original weight of conditioned specimen
W2 = Weight of specimen after being subject to water
4.5.3 Toxicity test. The contractor shall furnish information, which certifies that the finished
product is composed of materials, which have been safely used commercially or provide sufficient
toxicity data to show compatibility with prolonged, direct skin contact. At a minimum, toxicity
data should include results from a primary dermal irritation study in laboratory animals and a
repeated insult human patch test (Modified Draize Procedure). The latter shall be conducted under
the supervision of a qualified dermatologist using at least 100 free-living individuals.
4.5.3.1 Toxicity documents. All finishes/chemicals used to process the garment shall be
identified and accompanied by the appropriate Material Safety Data Sheet (MSDS) information.
The use of chemicals recognized by the Environmental Protection Agency (EPD) as human
carcinogens shall not be used.
4.5.4 Water absorption and hydrostatic resistance after DEET. The specimen, 4 inches
minimum by 4 inches minimum, shall be laid flat on a glass plate. Three drops of the test liquid
DEET shall be applied to the center of the specimen. Test the side of the sample (insert) facing
the shell. A glass plate of the same dimensions shall be placed on the specimen and a four-pound
weight placed in the center of the glass plate of the assembly. After 16 hours, remove the
specimen and test immediately for hydrostatic resistance or water permeability, as required.
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