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More significantly, despite the fact that the polyester movie is not hearth-retardant, the application of the adhesive to the movie to bond it to the scrim makes the general laminate fireplace-retardant. Consequently, even after it has been in roll form for a comparatively long time, the tape may be pulled from the roll with out "pickoff" of the film from the scrim. Still one other object is to supply a service entrance cable using one or more layers of such tape between the cable conductors and the cable outer jacket. Probably the most prevalent kind of service entrance cable in use in the present day employs conductors wrapped with a layer of polyethylene terephthalate which is, in turn, surrounded by braided in situ fiber sheath impregnated and lined with asphalt and then lacquered. A similar tape using a fiberglass substrate impregnated with polymerized chloroprene disclosed in U.S. All of these elements make the present tape a highly successful commercial product whose attributes are additionally loved by the cable system into which the tape is integrated.

Therefore, the 2 layers are urged collectively with out the glass fibers in the scrim being cracked by excessive pressure. A barrier layer in the form of a skim coat of flame-retardant unvulcanized polychloroprene is calendered on the glass cloth and at last an outer jacket of synthetic rubber is extruded in place onto the tapered conductors and fused to the underlying barrier layer. Pat. No. 3,602,636. Basically, it makes use of an open weave glass fiber tape wrapped around the clustered conductors. Therefore, the thickness and, hence, weight of the tape as a complete are lower than those of conventional service entrance cable tape incorporating a natural or synthetic rubber barrier layer which is calendered immediately onto the scrim. In a typical tape, the polyester film 24 is on the order of 0.5 mil thick and the adhesive layer is just on the order of 0.2 to 0.Three mil in thickness. When the movie 24 is bonded to the scrim 22 by way of the intervening layer of adhesive 26, relatively little bonding stress is utilized.

The adhesive is coated onto the polyester film underneath relatively low utility strain and then the movie and scrim are introduced together while in a drying oven, the scrim being underneath comparatively high lengthwise tension and the coated movie being underneath a lesser tension, with the consequence that the scrim and movie adhere tenaciously to each other. To make the tape, the relatively low viscosity adhesive 26 is coated onto the polyester film utilizing a standard coating roll set for minimal utilized strain. The primary motive for it's because the polyester film and adhesive coating thereon is thinner and fewer dense than the comparatively heavy unvulcanized rubber or neoprene barrier coating calendered on the prior tapes. That prior type of cable is disadvantaged too because the unvulcanized barrier layer just isn't completely steady; it comprises pinholes which offer passages for air or moisture which adversely have an effect on the dielectric power of the cable insulation. These components additional adversely have an effect on the overall insulating characteristics of the cable. Another object is to offer a way of making tape having a number of of the above characteristics. The utilization of the laminate adhesive also improves the hearth-resistance traits of the cable. Secondly, the utilization of the relatively low viscosity adhesive because the bonding agent provides a lubricant which appears to wick up between the person fibers in the scrim, thereby lowering the tendency of the fibers to abraid each other under stress.

The viscosity of the composition is controlled by various the ratio of liquid part to stable component. The preferred fire retardant composition contains a two part mixture having a liquid component and a stable component, though the composition could be prepared as a single mixture. Preferably, the solid component is added to the liquid element moderately than vice-versa, and the composition is mixed slowly in order not to vastly aerate the composition. The claimed invention relates to a water-insoluble fireplace retardant coating composition comprising a sodium silicate/latex mix and a silica-containing powder and a method of rendering ignitable cables, preferably PVC cables, fireplace resistant. The claimed composition may be utilized in one or more coats to the surface of the cable or other material being made fire resistant. In this method, the composition may be made suitable for utility to cables and the like by brushing, rolling, spraying or trowelling.

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