MIL-DTL-31011B
TABLE I. Physical requirements (Continued)
Type
Characteristic
I
II
III
IV____
V
Water permeability (min)
Initial
No leakage No leakage No leakage
No leakage No leakage
After synthetic perspiration
Initial and after laundering
----
----
No leakage
No leakage
---
After physical surface
appearance
No leakage No leakage
----
----
No leakage
o
After flex (70 F)
Warp and filling directions
----
----
No leakage
No leakage No leakage
o
After cold flex (-25 F)
Warp and filling directions No leakage ----
----
No leakage
---
o
After cold flex (-40 F)
Warp and filling directions No leakage No leakage No leakage
No leakage No leakage
After diethyltoluamide
Initial and after laundering No leakage No leakage No leakage
No leakage No leakage
After diesel fuel
Initial and after laundering No leakage No leakage No leakage
No leakage
---
Water permeability (min)
After weapons lubricant
Initial and after laundering No leakage No leakage No leakage
No leakage
----
After motor oil
Initial and after laundering No leakage No leakage No leakage
No leakage
----
After JP-8 fuel
Initial and after laundering No leakage No leakage No leakage
No leakage
----
1/ The cloth shall not become stiff or brittle nor soft and tacky and there shall be no evidence of
cracking or crazing under visual examination.
2/ Applicable to fabrics with a continuous film or coating.
3/ The report shall include only the result for each of the test specimens; no individual test
specimen result shall be greater than 7.5 centimeters.
3.4 Spray rating. Equal to or better than 100,90, 90 initially (Types I, II, IV and V) and 90, 90,
80 after 3 launderings (Types I, II, III, and IV) and 90, 90, 90 after 5 launderings (Type V). Not
applicable to fabrics with a continuous film or coating on the face side.
3.5 Resistance to organic liquids (All Types). The cloth shall show no wetting initially and after
laundering. Not applicable to fabrics with a continuous film or coating on the face side.
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