MIL-PRF-28523C
3.5 Physical requirements. The hose and hose assembly shall conform to the requirements
specified in table I and the following paragraphs when tested as specified in 4.7.
TABLE I. Performance requirements.
Hydrostatic test pressures (minimum)
Proof pressure (psi)
800 (5 516 kilopascal (kPa))
Burst pressure (psi)
1600 (11 032 kPa)
Tensile strength of rubber compound
(before aging) (minimum)
850 (5 861 kPa)
Tube, psi
1000 (6 895 kPa)
Cover, psi
Elongation (minimum)
Tube (percent)
175
Cover (percent)
200
Adhesion (minimum)
Between plies and between rubber
12 (83 kPa)
3.5.1 Resistance to water.
3.5.1.1 Swelling. The increase in the volume of the tube shall be not greater than 20 percent
when tested as described in 4.7.4.
3.5.2 Resistance to oil. The tensile strength of the tube and cover shall be not less than
700 pounds per square inch (psi) (4 826 kPa) when tested as specified in 4.7.7.
3.5.3 Accelerated aging. The tensile strength of the tube and cover after the accelerated aging
process described in 4.7.5 shall be not less than 80 percent of the tensile strength indicated before
the aging process, and ultimate elongation shall be not less than 50 percent of the values specified
in table I.
3.5.4 Ozone resistance. The cover compound of the hose shall show no visible cracking under
2X magnification after exposure to ozone as specified in 4.7.8.
3.6 Identification marking. Each length of hose shall be marked on the cover in two places,
approximately 4 feet (1 219 mm) from the ends. The marking shall be in letters not less than
0.125-inch (3 mm) high and shall include: (a) the manufacturer's name or trademark, (b) the
maximum working pressure (e.g., working pressure 400 psi (2 758 kPa)), and (c) the quarter of
the calendar year and the year of manufacture.
3.7 Dimensions. The inside diameter of the hose shall be 2.00 inches or 3.00 inches ± 0.062-inch
(51 mm or 76 mm ± 2 mm), as specified (see 6.2). Unless otherwise specified (see 6.2), the hose
length shall be 50 feet (15 240 mm). The length of the hose shall be measured from the ends of
the hose, not from the ends of the couplings. A tolerance of not greater than ± 1 percent shall be
permitted in the length of the hose.
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