MIL-PRF-22191F
TABLE I. Performance requirements Continued.
Characteristics
Types I, II, III
Test Paragraph
Requirements
Reference
2. Sealed before aging at 160 °F for 12 days and
tested:
No separation
a. At room temperature (separation-inches)
b. At 100 °F and at 160 °F (separation-inches)
No separation
3. Sealed after aging at 160 °F for 12 days and
tested:
No separation
a. At room temperature (separation-inches)
b. At 100 °F and at 160 °F (separation-inches)
No separation
Seam fabrication
No leakage at double
4.6.2
seam junction
Water Vapor Transmission Rate (WVTR)
4.6.1
(Type I only)
1. After room temperature flexing:
a. As received (gms/100 sq. in./24 hrs.) (max)
0.02
b. Aged (gms/100 sq. in./24 hrs.) (See 4.6.4)
0.02
(max)
2. WVTR after low temperature flexing:
0.03
As received (gms/100 sq. in./24 hrs.) (max)
Transparency
4.6.1
a. As received
Read lettering 3 inches
b. After aging 12 days at 160 °F
behind material
Puncture resistance
4.6.1
a. Type I (lbs, (min)
10
b. Type II (lbs, (min)
8.0
c. Type III (lbs, (min)
6.0
Blocking resistance
No blocking
4.6.1
delamination or
rupture
Resistance to curl (Class 1 only)
Shall not curl in
4.6.1
excess of 5 % or back
upon itself
Contact corrosivity
No corrosion, etching
4.6.1
or pitting
5
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