MIL-DTL-28693A
TABLE I. Requirements for rubber (tube, cover, and friction) used in hose.
Test
Properties
Tube
Cover
Friction
paragraph
Initial properties:
psi
2300
1600
Tensile strength
minimum
percent
300
350
Ultimate elongation
minimum
psi
30
30
30
Adhesion
minimum
Properties after immersion
in test fluid:
psi
1400
800
Tensile strength
minimum
percent
200
200
Ultimate elongation
minimum
Volume increase, percent
percent
30
30
30
(no shrinkage permitted)
maximum
psi
Adhesion
20
20
20
minimum
Properties after oven aging:
psi
2000
1450
Tensile strength
minimum
percent
250
250
Ultimate elongation
minimum
percent
3.0
Nonvolatile extract from tube
maximum
Determination
Absent
Phosphate plasticizer in tube
qualitative
No
No
Resistance of cover to ozone
Visual
cracking
cracking
No
No
Low temperature bend
Visual
cracking
cracking
3.4.3 Dimensions.
3.4.3.1 Tube thickness. The tube thickness shall be .094-inch (28.65 mm) minimum, when
measured in accordance with 4.7.1.3.
3.4.3.2 Cover thickness. Cover thickness shall be .078-inch (23.77 mm) minimum when measured
in accordance with 4.7.1.3.
3.4.3.3 Length. The length of the hose shall be 100 ±1 foot (30.5 m ± 0.30 m), when measured in
accordance with 4.7.1.1.
3.4.3.4 Inside diameter (ID). The inside diameter shall be 6 +.125 -.000 inches (15.2 cm +3.18 mm
-0.00 mm), when measured in 4.7.1.2.
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