MIL-PRF-370J
TABLE III. Hose physical and chemical properties - Continued.
Hose type
Test method
Physical properties
Requirements
ABCD
ASTM
Test
Low temperature flexibility
Young's modulus
XX
10,000 psi, maximum
D1053
4.3.6.4.1
Relative torsional
X
5, maximum
modulus
D471
Brittleness
X
No evidence of cracking
D746
4.3.6.4.2
D2137
Modulus of elasticity:
Tube -
X
10,000 psi, maximum
D790
4.3.6.4.3
Cover -
X
5000 psi, maximum
Resistance to Aging
Tensile Strength
XXXX
70% of original, minimum
XX
X
50% of original, minimum
D 573
4.3.6.5
Ultimate elongation
X
70% of original, minimum
Existent gum
20 mg/100 mL 2/
XX
X
D381
of test fluid, maximum
4.3.6.6
D471
6 mg/100 mL of test fluid,
X
maximum
Crush resistance:
85% of original diameter,
Under load -
X
X
minimum
---
4.3.6.7
95% of original diameter,
After load release -
X
X
minimum
No deformation, crimping, or
Bend radius
X
X
---
4.3.6.8
loss of pressure
No visible cracking (viewed
D518
Ozone resistance
XXXX
4.3.6.9
under 7x lens)
D1149
Report number of cycle
Abrasion resistance
X
needed to expose reinforcing
D3389
4.3.6.10
(When Required see 6.2)
material.
1/ lbf/in. = Pounds-force per inch
2/ mg/100 mL = milligrams per 100 milliliters
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