Cable having superior resistance to flame spread and smoke...

G - Physics – 02 – B

Patent

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G02B 6/44 (2006.01) H01B 7/295 (2006.01) H01B 11/00 (2006.01) H01B 7/34 (1995.01)

Patent

CA 2089905

A communications cable (20) in which plastic material which is disposed about each transmission medium thereof is characterized by a relatively low dielectric constant. The cable exhibits relatively low flame spread and low smoke generation while maintaining circuit integrity through a fire retardant composition which includes a mixture of an organic resin and first and second inorganic oxide constituents. The first inorganic oxide constituent is characterized by a melting point in the range of about 350°C. The second inorganic oxide constituent comprises a highermelting devitrifying frit which begins to crystallize at about 650°C. Advantageously, when the cable is exposed to high temperatures, the mixture of the first and second inorganic oxide constituents melts and forms a crusty layer which is interposed between the covering plastic material and other components of the cable.

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