MIL-DTL-13531J
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a
specific exemption has been obtained.
3. REQUIREMENTS
3.1 Qualification. Hose and hose assemblies furnished under this specification shall be products that
are authorized by the qualifying activity for listing on the applicable qualified products list before contract
3.2 Materials. Materials shall be as identified herein or as approved by the qualifying activity.
However, when a definite material is not specified, a material shall be used which will enable the hose of
hose assembly to meet the requirements of this specification. Acceptance or approval of any constituent
material shall not be construed as a guarantee of acceptance of the finished product.
3.2.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.3 Dissimilar metals. When dissimilar metals are used in intimate contact with each other,
protection against electrolysis and corrosion shall be provided. Dissimilar metals such as brass, copper
or steel (except corrosion-resisting steel passivated in accordance with SAE-AMS2700) shall not be
used in intimate contact with aluminum or aluminum alloy. Protective measures for dissimilar metals
shall be in accordance with MIL-STD-889.
3.4 Hose construction. Hose shall be constructed with an inner tube, wire reinforcement (see 3.4.1),
and an outer cover. Synthetic rubber shall be used as friction/insulation layers between reinforcement layers.
The entire construction shall be vulcanized so that the cover, wire reinforcement, and inner tube are bonded to
the reinforcement layers.
3.4.1 Reinforcement. Wire reinforcement shall be type I, type II, or type III as specified in specified in
3.4.1.1, 3.4.1.2, or 3.4.1.3. The wire braid shall be braided to resist tension so as to provide strength
and limit expansion of the hose to a minimum. No length of hose shall contain missing, broken or
spliced wire braid or reinforcing material.
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