MIL-DTL-3992 Hose And Hose Assembly, Rubber, Air And Vacuum Brake, SystemsThis specification covers the construction, performance, and quality requirements of hose and hose assembly, rubber, air and vacuum brake systems intended for use as flexible connections on automotive air and vacuum brake systems in a temperature range from -60 degrees F to +200 degrees F \(-51.1 degrees C to +93.3 degrees C\), inclusive \(see 6.1\).
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MIL-DTL-3992F

4.8 Test methods.

4.8.1 Visual inspection. Hose and hose assemblies shall be examined to ensure conformance with

this specification and associated specification sheets. Continuous examination shall be performed to

assure compliance with the following requirements:

Specification sheets (3.1).

Materials (3.4).

Design, construction and physical dimensions (3.5 and 3.6).

Marking (3.8).

Workmanship (3.9).

4.8.2 Test requirements applicable to both type I and II hose and hose assemblies.

4.8.2.1 Hydrostatic bursting test (see 3.7.1.1). Hose specimens, 18 inch (457.20 mm) long, when

subjected to hydrostatic bursting test in accordance ASTM D380 shall meet the requirements of 3.7.1.1.

Oil IRM 903 in accordance with ASTM D471 may be used in lieu of water as the burst medium.

4.8.2.2 Adhesion (see 3.7.1.2). Hose specimens when subjected to adhesion tests in accordance

with ASTM D622 shall meet the requirements of 3.7.1.2. The following details shall apply:

a. Fiber reinforced hose shall be tested in accordance with ASTM D413, machine method, the entire

specimen should be separated to establish the average load required for separation of the plies.

b. Sharp abrupt changes in load for a short duration of time should be discounted in establishing the

average load value for a given specimen.

4.8.2.3 Ozone resistance (see 3.7.1.3). Hose specimens when subjected to ozone resistance tests in

accordance with ASTM D622 shall meet the requirements of 3.7.1.3.

4.8.2.4 Oil immersion test (see 3.7.1.4). Test specimens subjected to the oil immersion test in

accordance with ASTM D471 shall meet the requirements of 3.7.1.4. The following details shall apply:

a. Test specimens in accordance with ASTM D471.

b. OIL - IRM 903.

c. Oil temperature 212�F �3.6�F (100�C �2�C).

4.8.2.5 Fungus resistance (see 3.7.1.5). Hose specimens when subjected to the fungus resistance

test in accordance with ASTM G21 shall meet the requirements of 3.7.1.5. The following details shall

apply:

a. Test specimens - 36 inches (914.40 mm) length.

b. Test shall be continuous for 90 days.

c. After 90 days, the hose shall be subjected to the hydrostatic burst pressure test specified in

4.8.3 Tests for type I air brake hose.

4.8.3.1 Proof pressure test (see 3.7.2.1). Type I hose assembly when subjected to the proof pressure

test in accordance with ASTM D622 shall meet the requirements of 3.7.2.1.

4.8.3.2 Assembly tension test (see 3.7.2.2). Type I hose when subjected to the assembly tension

strength test specified in ASTM D622 shall meet the requirements of 3.7.2.2.