FLAME RESISTANT FIBERGLASS INSULATION, PRODUCTS, AND METHODS
Provided are fiberglass insulations which have a softening point of less than, or no more than, 699° C., and an elevated glass viscosity at the UL 181 test temperature of 774° C. Also provided are insulated products, such as ducts, which have the fiberglass insulations thereon, as well as methods of improving the flame penetration resistance of an insulated product.
1 . A flame resistant fiberglass insulation having a softening point of no more than, or less than, 699° C., and an elevated glass viscosity.
2 . The insulation of claim 1 wherein the softening point is between about 680 to about 699° C.
3 . The insulation of claim 2 wherein the softening point is between about 685 to about 695° C.
4 . The insulation of claim 1 wherein the elevated glass viscosity is between about greater than log 10 of 6.0 to about 6.3.
5 . The insulation of claim 4 wherein said elevated glass viscosity is from about log 6.1 to about 6.3.
6 . The insulation of claim 1 wherein the combined amount of alumina and boric oxide is between about 6.1 to about 8.5 wt. %.
7 . The insulation of claim 6 wherein said combined amount of alumina and boric oxide is less than about 7 wt. %.
8 . The insulation of claim 1 wherein the alkali content is about above 15 wt. %.
9 . The insulation of claim 8 wherein the alkali content is in the range of between about 15 to about 16.5 wt %.
10 . An insulated duct for conducting a fluid comprising a wall or walls defining a hollow interior for conducting a fluid, and a layer of insulation of claim 1 wrapped about said wall or walls.
11 . The insulated duct of claim 10 wherein said wall is tubular.
12 . A method of improving the flame penetration resistance of an insulated duct, the insulated duct comprising a wall or walls defining a hollow interior for conducting a fluid, and a layer of insulation wrapped about the wall or walls, the method comprising providing the insulation of claim 1 .