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More notably, despite the fact that the polyester film will not be fire-retardant, the appliance of the adhesive to the film to bond it to the scrim makes the general laminate fire-retardant. Consequently, even after it has been in roll type for a relatively very 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 using a number of layers of such tape between the cable conductors and the cable outer jacket. Essentially the most prevalent sort of service entrance cable in use in the present day employs conductors wrapped with a layer of polyethylene terephthalate which is, in flip, surrounded by braided in situ fiber sheath impregnated and lined with asphalt after which lacquered. An analogous tape using a fiberglass substrate impregnated with polymerized chloroprene disclosed in U.S. All of those components make the present tape a extremely profitable industrial product whose attributes are additionally enjoyed by the cable system into which the tape is integrated.

Therefore, the two layers are urged together without the glass fibers within the scrim being cracked by excessive strain. A barrier layer in the form of a skim coat of flame-retardant unvulcanized polychloroprene is calendered on the glass cloth and finally 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 lower than these of conventional service entrance cable tape incorporating a pure or synthetic rubber barrier layer which is calendered straight onto the scrim. In a typical tape, the polyester movie 24 is on the order of 0.5 mil thick and the adhesive layer is just on the order of 0.2 to 0.3 mil in thickness. When the movie 24 is bonded to the scrim 22 by means of the intervening layer of adhesive 26, comparatively little bonding strain is utilized.

The adhesive is coated onto the polyester movie beneath relatively low application pressure and then the film and scrim are brought together while in a drying oven, the scrim being under relatively high lengthwise tension and the coated movie being beneath a lesser tension, with the outcome that the scrim and film adhere tenaciously to one another. To make the tape, the relatively low viscosity adhesive 26 is coated onto the polyester movie utilizing a standard coating roll set for minimum applied stress. The primary cause for this is 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 as a result of the unvulcanized barrier layer is not utterly steady; it accommodates pinholes which give passages for air or moisture which adversely have an effect on the dielectric power of the cable insulation. These factors further adversely affect the general insulating traits of the cable. Another object is to provide a way of constructing tape having one or more of the above characteristics. The utilization of the laminate adhesive additionally improves the fire-resistance traits of the cable. Secondly, the utilization of the relatively low viscosity adhesive as the bonding agent gives a lubricant which seems to wick up between the person fibers in the scrim, thereby lowering the tendency of the fibers to abraid each other below stress.

The viscosity of the composition is controlled by varying the ratio of liquid part to solid component. The popular hearth retardant composition contains a two part mixture having a liquid element and a stable component, although the composition will be prepared as a single mixture. Preferably, the strong part is added to the liquid component relatively than vice-versa, and the composition is mixed slowly in order to not tremendously aerate the composition. The claimed invention pertains to a water-insoluble fireplace retardant coating composition comprising a sodium silicate/latex blend and a silica-containing powder and a way of rendering ignitable cables, ideally PVC cables, fire resistant. The claimed composition may be utilized in a number of coats to the surface of the cable or other material being made fire resistant. On this manner, the composition may be made appropriate for application to cables and the like by brushing, rolling, spraying or trowelling.

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