MIL-PRF-87260B(USAF)
TABLE I. Physical properties and characteristics.
Property
Requirement
Grade I
Grade II
Test Para.
Ref.
Color
See 4.5.2
See 4.5.2
Density Range (lbs/ft3)
1.20-1.50
1.20-1.50
Density Uniformity (lbs/ft3)
Report
Report
Porosity (Air Pressure Drop)*
7.5-21.0
21.5-33.0
Air Pressure Drop (in. water)
0.150-0.250
0.260-0.360
Tensile Strength (psi)
10.0 min
15.0 min
Ultimate Elongation (percent)
100.0 min
100.0 min
Tear Resistance (psi)
3.0 min
3.0 min
Constant Deflection Compression Set
45.0 max
45.0 max
(percent)
Compression Load Deflection at 25 percent
0.35 min
0.35 min
(psi)
Compression Load Deflection at 65 percent
0.60 min
0.60 min
(psi)
Fuel Displacement (vol percent)
2.50 max
2.50 max
Fuel Retention (vol percent) **
2.50 max
5.00 max
Water Retention (vol percent)
Report
Report
Extractable Materials (wt. percent)
3.0 max
3.0 max
Volume Increase (vol. percent)
Type I Fluid
0-15.0
0-15.0
Type III Fluid
0-40.0
0-40.0
JP-8 Turbine Fuel
0-25.0
0-25.0
Low Temperature Flexibility
No Cracking or Breaking
of Strands
Entrained Solid Contamination (mg/ft3)
11.0 max
11.0 max
Steam Autoclave Exposure (percent tensile
30.0 max
30.0 max
loss)
1.0x107 to 5.0x1011
Electrical Resistivity (ohm-cm) at 72°F
Electrical Resistivity Uniformity at 72°F
2 Orders of Magnitude
maximum
from Top to Bottom
*For information only (not for procurement certification)
** To be determined at the maximum air pressure drop limit
7
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