Method of making flame retardant EPR unipass telephone drop wire

Details Method of making flame retardant EPR unipass telephone drop wire Method of making flame retardant EPR unipass telephone drop wire

1978-09-25

1980-07-29

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With printing or coating of workpiece

Coating or impregnating workpiece before molding or shaping...

174110AR, 264174, 264236, 425114, B29F 310

Patent

active

042150868

ABSTRACT:
This telephone drop wire is insulated with an improved insulation made from a semi-crystalline, low molecular weight, ethylene-propylene diene terpolymer (EPDM) which is used for a unipass insulation. The insulation has improved electrical properties which permit thinner sections of insulation to be used, so that the overall cross-section of the drop wire is of lower cost, higher temperature rating, and with moisture resistance suitable for use buried underground. The insulation is also much tougher for use where abrasion is a factor.

REFERENCES:
patent: 1862005 (1932-06-01), Cherry et al.
patent: 3102160 (1963-08-01), Cook et al.
patent: 3148169 (1968-09-01), Martens
patent: 3328510 (1967-06-01), White
patent: 3681515 (1972-08-01), Mildner
Luh--Ethylene--Propylene Terpolymers in Wire & Cable Constructions--Wire & Wire Products--Apr. 1970, pp. 79-81.
Keeley et al.--New EPDM Developments for Electrical Industry Applications--Dupont, 1974, pp. 1-17.
Bedwell--Types of Nordel Hydrocarbon--Dupont Brochure, 1974.

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