Accession Number:

AD0656097

Title:

ENVIRONMENTAL SEALING OF CONNECTORS ON MILITARY CABLES,

Descriptive Note:

Corporate Author:

SANDIA CORP ALBUQUERQUE N MEX

Personal Author(s):

Report Date:

1963-11-01

Pagination or Media Count:

43.0

Abstract:

Excellent sealing of connectors on military cable assemblies against the entrance of moisture and water vapor was achieved with a polyurethane potting compound. The excellent sealing and adhesive qualities of the potting compound were found to depend on the application of the correct processing procedures. The cable assembly evaluated in this report withstood most of the thermal, humidity, and mechanical overtests that were applied. Both branches of eight cable assemblies and only one branch of four other assemblies exhibited shield resistances in excess of the required limits as a result of the environmental overtests. Out-of-tolerance shield resistances were attributed principally to discontinuities of the braid wire between the clamp plates. The discontinuities occurred because of 1 the relatively small percentage of wire braid that was securely clamped, 2 the tolerance buildup on the features of the clamp plates, and 3 physical changes that occurred to the wire during testing. Corrosion formation was not the cause of discontinuity between these parts. The Loctite adhesive produced an excellent bond between the jam nut and the connector shells and produced a permanent mechanical interlock between these parts. When properly applied and suitably converted, the chromate finishes on aluminum will effectively withstand accelerated environments and severe handling. Radiographic inspection of potted connectors is an effective nondestructive method for determining quality of potting and quality of assembly workmanship. Author

Descriptors:

Subject Categories:

  • Electrical and Electronic Equipment
  • Adhesives, Seals and Binders

Distribution Statement:

APPROVED FOR PUBLIC RELEASE


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