MIL-PRF-20696F
4.4.7 Oil resistance. One 8 by 8 inch specimen shall be placed on a wood frame. The inside
dimensions of the frame shall be 6 inches by 6 inches by 1 inch. The specimen shall be
forced into the frame by a wood block 5-3/4 by 5-3/4 inches (with round corner) to form a
basin of uniform depth. The edges of the cloth shall be tacked to the frame and the block
removed. Lubricating oil, conforming to Grade 50 of SAE J 1966 shall be rapidly poured into
the basin to a 1/2 inch depth. After the oil has been in the basin for 1 hour, the bottom of the
fabric specimen forming the basin shall be examined to determine if oil has seeped through or
permeated the cloth.
4.4.8 Resistance to aromatic hydrocarbon fluid. One, 1 by 6 inch specimen with the long
dimension parallel to the warp shall be immersed for 5 minutes in aromatic hydrocarbon fluid
conforming to Reference fuel D of ASTM D 471. The specimen shall be dried at room
temperature for 2 hours (+ 5 minutes) and then be creased sharply on itself, with the face side
toward the outside of the fold. A similar specimen, except with the long dimension parallel to
the filling shall be tested in the same manner.
4.4.9 Resistance to accelerated weathering. The cloth shall be subjected to the accelerated
weathering procedure specified in 4.4.2. After completion of the procedure, each specimen
shall be folded by hand, face out, sharply upon itself and visually examined along the fold for
cracking and crazing. Each specimen shall then be opened flat and examined for blooming,
chalking or appreciable color change (An appreciable color change is one that is noticeable
on first glance when comparing the tested specimen with the original unexposed cloth).
4.4.10 Resistance to low temperature. A 1 by 4 inch specimen of the cloth with the long
dimension warpwise and a 1 by 4 inch specimen of the cloth with the long dimension
fillingwise shall be exposed for 4 hours at a temperature of minus 70 + 5oF with the
temperature recorded at the lowest point in the chamber. The sample, still in the test
atmosphere, shall then be bent sharply, face side of the cloth to the outside of the fold, 180
degrees over a 1/8 inch steel rod that has been exposed in the test chamber with the test
specimen.
4.4.11 Resistance to high temperature. A 2 by 6 inch specimen of the cloth shall be exposed
for a period of 6 hours in an electrically heated oven maintained at a temperature of 170o +
2oF. At the end of the exposure period, the specimen shall, while still maintained at the test
temperature, be bent 180 degrees over a 1/8 inch steel rod with the face side of the cloth to the
outside of the fold.
4.4.12 Matching. The color and shade shall match the standard sample when viewed under
filtered tungsten lamps that approximate artificial daylight and that have a correlated color
temperature of 7500 + 200oK, with illumination of 100 + 20 foot candles, and shall be a good
match to the standard sample under incandescent lamplight at 2300 + 200oK.
4.4.13 Toxicity assessment. The waterproof cloth shall be tested for toxicity as follows:
a) Title 40, Code of Federal Regulations, 1994 Edition;
Section 798.4100- Dermal Sensitization
Section 798.4470- Primary Dermal Irritation
Section 798.4500- Primary Eye Irritation
Marzulli, F. & H. Maibach, "Contact Allergy: Predictive Testing in Humans",
Advances in Modern Toxicology, Volume 4, pp 353-372, 1977.
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