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More particularly, even though the polyester movie isn't fire-retardant, the application of the adhesive to the film to bond it to the scrim makes the overall laminate fire-retardant. Consequently, even after it has been in roll kind for a comparatively long time, the tape could also be pulled from the roll without "pickoff" of the movie from the scrim. Still one other object is to offer a service entrance cable employing 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 as we speak 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 employing a fiberglass substrate impregnated with polymerized chloroprene disclosed in U.S. All of these factors make the current tape a highly successful industrial product whose attributes are additionally loved by the cable system into which the tape is incorporated.

Therefore, the 2 layers are urged together without the glass fibers in the scrim being cracked by extreme strain. A barrier layer within 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 across the clustered conductors. Therefore, the thickness and, hence, weight of the tape as a complete are less than these of conventional service entrance cable tape incorporating a natural or synthetic rubber barrier layer which is calendered instantly 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 only on the order of 0.2 to 0.Three mil in thickness. When the movie 24 is bonded to the scrim 22 by the use of the intervening layer of adhesive 26, comparatively little bonding stress is applied.

The adhesive is coated onto the polyester movie underneath relatively low utility stress after which 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 outcome 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 movie using a conventional coating roll set for minimal utilized stress. The primary motive for it's because the polyester movie and adhesive coating thereon is thinner and fewer dense than the relatively heavy unvulcanized rubber or neoprene barrier coating calendered on the prior tapes. That prior type of cable is disadvantaged too as a result of the unvulcanized barrier layer is not utterly continuous; it incorporates pinholes which offer passages for air or moisture which adversely have an effect on the dielectric energy of the cable insulation. These factors additional adversely affect the general insulating traits of the cable. Another object is to provide a method of constructing tape having one or more of the above characteristics. The utilization of the laminate adhesive additionally improves the fire-resistance characteristics of the cable. Secondly, the utilization of the comparatively low viscosity adhesive because the bonding agent supplies a lubricant which appears to wick up between the individual fibers within the scrim, thereby reducing the tendency of the fibers to abraid each other beneath stress.

The viscosity of the composition is controlled by varying the ratio of liquid element to solid component. The popular fireplace retardant composition comprises a two part mixture having a liquid element and a solid part, though the composition may be ready as a single mixture. Preferably, the stable part is added to the liquid element reasonably than vice-versa, and the composition is combined slowly so as to not drastically aerate the composition. The claimed invention pertains to a water-insoluble fire retardant coating composition comprising a sodium silicate/latex blend and a silica-containing powder and a way 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. On this manner, the composition may be made appropriate for utility to cables and the like by brushing, rolling, spraying or trowelling.

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