MIL-PRF-11588 Hose Assemblies, Rubber, Synthetic, Liquid Petroleum Fuels, Dispensing, Collapsible, Standard And Low TemperatureThis specification defines the requirements for collapsible, synthetic rubber, discharge hose assemblies for use in all ambient temperatures between minus \(-\) 25 and plus \(+\) 160 degrees Fahrenheit \(Degrees F\) for standard temperature hose and -60 and +95 Degrees F for low temperature hose.

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MIL-PRF-11588H

3.5.4 Tensile strength. The tensile strength of the tube shall not be less than

1250 pounds per square inch (psi) and the tensile strength of the cover shall not be less than 1000

psi (see 4.5.6 and 4.5.6.1). After immersion, the tensile of the tube and cover strength shall be

not less than 600 psi or 40 percent of the original tensile strength.

3.5.5 Ultimate elongation. When tested as specified in 4.5.6, the ultimate elongation of

the tube and cover shall be not less than 200% as specified in 4.5.6.1 or, when tested as specified

in 4.5.6.2, shall be not less than 40% of the original elongation obtained before immersion.

3.5.6 Adhesion.

3.5.6.1 Original. The adhesion of the cross section of hose shall be at least 10 pounds

(lbs) (see 4.5.6.3).

3.5.6.2 Adhesion after fill. After being exposed to aromatic hydrocarbon fluid (see

4.5.6.4), the adhesion of the cross section of the hose shall be at least 6 lbs.

3.5.7 Volume increase. The volume increase of the tube after immersion (see 4.5.7) shall

not exceed 40%, and the volume increase of the cover shall not exceed 70%.

3.5.8 Low temperature flexibility.

3.5.8.1 Relative modulus. For style ST hose, the relative modulus for the inner tube and

the outer cover shall be not greater than 5 times its value at room temperature (see 4.5.8.1).

3.5.8.2 Brittleness. For style LT hose, the low temperature brittleness shall be

determined for the tube and cover material after fuel extraction at -60F (-51C). There shall be

no evidence of cracking of the tube or cover material (see 4.5.8.2).

3.5.8.3 Modulus of elasticity. For style LT hose, the modulus of elasticity at -60F

(-51C) for the tube and cover materials shall be less than 1 x 105 psi for the tube and less than

0.05 x 105 psi for the cover (see 4.5.8.3).

3.5.9 Existent gum content. The existent gum value shall not exceed 20 mg/100 mL (see

4.5.9).

3.5.10 Continuity wire. Each finished hose assembly shall display a continuous electrical

circuit between the ends and couplings (see 4.5.10).