| 摘要 |
<p>A fire protective mastic is provided, whose essential component are solids including a low fusing ceramic frit, hydrated solids having chamically bonded water which is released a fire protective water vapor when heated solids which expand or intumesce during the same heat application to form a porous, expanded or foamy insulating body, solids which have a fire break affect, such as antimony oxide and zinc tetraborate, and binder solids which are thermoplastic resins and serve to bind the solids into a flexible coating when applied, the binder solids being dispersed as an emulsion in water and mixed with the other solids to form a mastic. With further addition of water it is converted to a selected viscosity for application by troweling, coating or spraying. The mastic is applied as a coating or a precast boot upon single or grouped electric power and control cables to restrict fire propagation and to prevent self ignition of cable from fires due to overloading or other electrical faults, or from oil, waste or trash fire sources. The mastic is further usefully shaped into fire protective panels the latter of which, when dried, can be mounted as a protective wall insulating a section of cable passing from area to area as a fire stop. The total panel can be formed of the dried mastic, or the mastic can be coated upon ne or both sides of insulating panels such as ceramic fiber boards, to further reduce the temperature gradient through the panel upon fire exposure and thus appreciably reduce the temperature on the cold side by 50-70.degree.F, thereby minimizing the danger of self ignition of gases or combustible materials such as cable jacketing, insulation or other flammable materials.</p> |
