DESIGN AND DEVELOPMENT OF IMPROVED WATERTIGHT COAXIAL CABLE.
Interim rept. no. 4, 1 Apr-30 June 63,
INTERNATIONAL SILVER CO WALLINGFORD CONN TIMES WIRE AND CABLE DIV
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Research was continued on the development of improved watertight coaxial cables. The test results show the developed waterblocking technique can be successfully used to produce versions of RG-214U, RG-217U and RG-218U which are watertight at 1000 psi. None of the watertight cables manufactured with the developed technique has ever leaked, even at pressures up to 5000 psi. The components of the cable, i.e., center conductor, dielectric, braid and jacket, have, however, moved in respect to each other on the short test lengths at pressures above 1000 psi. The general construction recommended for watertight coaxial cable is a bare copper center conductor, a polyethylene dielectric, an outer conductor consisting of a braid of silver plated copper strands with a low braid factor, and the braid treated with the DC-274. The tape over the braid and the jacket should be polyethylene or polyurethane, depending on the desired properties. Author