MIL-DTL-25579G
3.6.15 Volumetric expansion. The volumetric expansion, measured in cc/in of free length, shall not be
greater than .028 inch (0.71 mm) for size 4 and .040 inch (1.02 mm) for size 5 when tested in accordance with
3.6.16 Low temperature flexibility. When tested in accordance with 4.5.16 and subjected to the applicable
bend radius specified in table III, the hose assembly shall not leak or exhibit any visible evidence of permanent
deformation or damage.
3.6.17 Vacuum. The hose shall not collapse or show any evidence of defects when subjected to testing in
accordance with 4.5.17. The ball shall roll freely through the entire length of the hose, unaided, to indicate that
the inside diameter of the hose has not been distorted or reduced.
3.6.18 Pneumatic leakage. When subjected to testing in accordance with 4.5.18, a steady stream of
bubbles shall not be seen from any area of the hose assembly.
3.6.19 Fire resistance. When fire resistance or fireproofing is required (see 6.2), the hose assembly shall
not rupture or leak when subjected to testing in accordance with 4.5.19.
3.6.20 Cleanliness. Prior to shipping, the end fittings of the hose assembly shall be capped or plugged to
prevent entrance of moisture and foreign matter. The caps or plugs shall be securely attached and shall
withstand normal strains, jarring, vibrations encountered during shipping, storage and handling. The interior
surface of the hose assembly shall be free from oil, grease, dirt, moisture, cleaning solvents and foreign
materials. All hose assemblies shall be cleaned in accordance with SAE-AS611, class O. During conformance
inspection, hose assemblies with uncovered ends shall be rejected and considered as a failure. The interior of
the assembly shall not contain any debris or foreign materials when examined in accordance with 4.5.20.
3.7 Identification of product.
3.7.1 Fittings. The fittings manufacturer's name or trademark shall be permanently marked on all end
fittings.
3.7.2 Hose assemblies. Marking shall be on permanent band or bands securely attached on the hose.
Bands shall not be wider than 1 inch (2.54 mm) and shall not impair the flexibility or the performance of the
hose. The bands shall be designed as to remain tight on the hose to prevent relative movement and resultant
chafing. Unless other wise specified, the marking on the band shall include the following information:
a. Assembly manufactures Commercial and Government Entity (CAGE) code
b. Part or Identifying Number (PIN) as specified in the applicable specification sheet.
c. Operating Pressure (3000 psi) as applicable to table III.
d. Operating temperature (450ºF or 275ºF) as applicable see paragraph 1.2.
e. Pressure test symbol (PT).
f. Date of hose assembly manufacture expressed as month and year (MM/YY).
g. Hose manufacturers CAGE if different than the hose assembly manufacture.
3.8 Interchangeability. All hose assemblies having the same manufacturer's part number shall be
functionally and dimensionally interchangeable.
3.9 Workmanship. All surfaces shall be free from burrs. All sealing surfaces shall be smooth, except that
annular tool marks shall not be greater than 100 microinches.
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