Cable having superior resistance to flame spread and smoke evolu

Details Cable having superior resistance to flame spread and smoke evolu Cable having superior resistance to flame spread and smoke evolu

1992-03-06

1992-12-22

Lee, John D.

Optical waveguides

Optical transmission cable

174 681, 174121A, G02B 644

Patent

active

051739607

ABSTRACT:
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.degree. C. The second inorganic oxide constituent comprises a higher melting devitrifying frit which begins to crystallize at about 650.degree. 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.

REFERENCES:
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patent: 4273821 (1981-06-01), Pedlow
patent: 4543281 (1985-09-01), Pedersen et al.
patent: 5016973 (1991-05-01), Hager et al.
patent: 5074640 (1991-12-01), Hardin et al.
"Recent Advances In Flame Retardancy of Polymeric Materials", vol. II, Buss, Communications Co., Inc., CT, May, 1991, pp. 87-93.
"Ceepree Fire Barrier Filler", Soda Ash Products, Sep. 1989.
"Ceepree Unique Fire Barrier From a Versatile Filler", ICI Soda Ash Products, Mar. 1990.
Piers, et al., "Enhanced Performance of Composite Materials Under Fire Conditions", Polymers In a Marine Environment Conference, London, Oct. 1991.
Stueflotten, "Development and a Fire-Resistant Optical Cable", Journal of Lightwave Technology, Aug. 1986.

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