MIL-DTL-83298C
4.8.2 Tube tests.
4.8.2.1 Density and relative density (see 3.6.1.1). Density and relative density when tested in
accordance with SAE-AS2078 the specific gravity of the PTFE tube shall meet the requirements of
4.8.2.2 Tensile strength (see 3.6.1.2). Two 6-inch (15.2 mm) tubes shall be tested as specified in
SAE-AS2078, except that the separation speed shall be 2 inches (51 mm) per minute.
4.8.2.3 Elongation (see 3.6.1.3). Two 6-inch (152 mm) tubes shall be tested as specified in
SAE-AS2078, except the separation speed shall be 2 inches per minute and shall meet the requirements
of 3.6.1.3.
4.8.2.4 Electrical conductivity test of tube (see 3.6.1.4). Two tubes shall be tested as specified in
SAE-AS2078 and shall meet the requirements of 3.6.1.4.
4.8.2.5 Tube roll (see 3.6.1.5). Prior to reinforcing, the two tubes shall be tested as specified in
SAE-AS2078 and shall meet the requirements of 3.6.1.5.
4.8.2.6 Tube proof pressure test (see 3.6.1.6). Prior to reinforcing the inner PTFE tube when tested
in accordance with SAE-AS2078 shall meet the requirements of 3.6.1.6. The following details shall apply:
a. Proof pressure of PTFE inner tube - minimum 3000 psig (20.7 Mpa) and higher.
b. An alkaline wetting agent may be added to the water bath to assist in defining the leakage.
c. Minimum testing time should be one minute.
4.8.3 Hose tests.
4.8.3.1 Proof pressure test (see 3.6.2.1). The hose shall be tested as specified in SAE-AS2078.
When subjected to the rated proof pressure specified in table II the hose shall meet the requirements of
4.8.3.2 Leakage (see 3.6.2.2). Prior to testing, the exterior of the samples shall be cleaned free of oil and
of any residues. Samples shall be subjected to testing in accordance with SAE AS2078. Test fluid shall be
water or fluid in accordance with MIL-PRF-5606, MIL-PRF-83282, or MIL-PRF-87257. A white paper towel,
wrapped tightly around the entire length of the sample, shall be used to check for leakage. Conformance shall
4.8.3.3 Burst tests (see 3.6.2.3).
4.8.3.3.1 Room temperature burst pressure test (see 3.6.2.3.1). A hose assembly shall be subjected
to the room temperature burst pressure test in accordance with SAE-AS2078 and shall meet the
requirements of 3.6.2.3.1. The assembly shall be observed throughout the test and the type of failure and
the pressure at which failure occurred shall be recorded.
4.8.3.3.2 High temperature burst pressure test (see 3.6.2.3.2). Hose assemblies when subjected to
high temperature burst pressure testing shall meet the requirements of 3.6.2.3.2. The assembly shall be
filled with one of the high temperature test fluids specified in 4.3.2 and tested as specified in
SAE-AS2078.
4.8.3.4 Elongation and contraction test (see 3.6.2.4). The unpressurized assembly shall be tested as
specified in SAE-AS2078 and shall meet the requirements of 3.6.2.4. After 5 minutes, while still
pressurized, the gauge length shall be remeasured and the change in length recorded.
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