MIL-DTL-28693A
ASTM D1149
-
Standard Test Method for Rubber-Deterioration-Surface Ozone
Cracking in a Chamber
(Copies of these documents are available online at https://www.astm.org or from ASTM International,
P.O. Box C700, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.)
SAE INTERNATIONAL
SAE-AS1933
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Age Controls for Hose Containing Age-Sensitive Elastomeric
Material
(Copies of these documents are available online at https://www.sae.org or from SAE World
headquarters, 400 Commonwealth Drive, Warrendale, PA 15096-0001.)
2.4 Order of precedence. 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 First article. When specified (see 6.2), samples shall be subjected to first article inspection in
accordance with 4.5.
3.2 Drawings. Drawings forming a part of this specification are engineering design drawings. The
contractor is responsible for preparing his own shop drawings. Where tolerances provided could
cumulatively result in incorrect fits, the contractor shall provide tolerances within those prescribed on the
drawings to ensure correct fit, assembly, and operation of the items. No deviation from the prescribed
dimensions or tolerances is permissible without the approval of the contracting officer.
3.3 Materials. Materials shall be as specified herein and in referenced specifications and standards
and other referenced documents. Materials not specified shall be selected by the contractor and shall
be subject to all provisions of this specification. Materials shall be free of defects, which adversely affect
performance of the finished product.
3.3.1 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.
3.4 Hose construction. The hose shall have a rubber tube, reinforcement consisting of either
braided synthetic fiber or yarn or multiple plies of synthetic fiber fabric held together with rubber friction,
and a rubber cover. Ester based polyurethane shall not be an acceptable material. The hose shall have
longitudinal reinforcement of synthetic fiber cord incorporated into the hose carcass and extending the
length of the hose. Both ends of the hose shall be cut square.
3.4.1 Inner tube. The inner tube material shall be polyurethane resins approved in U.S. Code of
Federal Regulations - CFR Title 21, Part 177, Section 2600 (21 CFR 177.2600) intended for use in
contact with aqueous food when extracted with distilled water at reflux temperature, shall yield total
extractives not to exceed 20 milligrams per square inch during the first 7 hours of extraction, nor to
exceed 1 milligram per square inch during the succeeding 2 hours of extraction in accordance with
21 CFR 177.2600.
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