Accession Number : AD0698685

Title :   PRESSURE DAMS IN COMMUNICATION CABLES,

Corporate Author : GENERAL CABLE CORP BAYONNE N J

Personal Author(s) : Masterson,J. B.

Report Date : OCT 1969

Pagination or Media Count : 16

Abstract : The polyurethane compounds as used today are an improvement over the previously-used epoxy systems. They exhibit better aging properties and lower peak exotherms. Further work is necessary in the development of polyurethane damming compounds, to lower the Free TDI and to provide greater long term hydrolytic stability. Plasticizers and other materials used to modify the physical properties of the materials must not be used to the detriment of the material's ability to form a good dam. Under extreme conditions of temperature and humidity these polyurethane compounds may revert hydrolytically. Projected life based on the time to liquify is only one indicator of the long-time performance of the compound. Compounds susceptible to weight loss as a result of aging may also fail in service. The toxicity of the free isocyanate in the prepolymer is definitely hazardous to the user. Residual TDI existing after the compound has been reacted must also be considered as a potential hazard. (Author)

Descriptors :   (*TELEPHONE LINES, PLASTIC SEALS), (*PLASTIC SEALS, *ISOCYANATE PLASTICS), PRESSURE, AGING(MATERIALS), PHYSICAL PROPERTIES

Subject Categories : Adhesives, Seals and Binders
      Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE