| 摘要 |
A flame resistant insulation product comprises a fibrous mineral material th at has been rotary fiberized, preferably a fibrous glass. The composition of the mineral material has a softening poi nt of at least about 699.degree.C (1290.degree.F). An insulated duct includes a tubular wall that defines a hollow interior for conducting a flui d, and a layer of the insulation product wrapped about the wall. The mineral material reduces the number of samples of the insulate d duct failing the flame penetration test of a UL 181 Standard compared to the same insulated duct with a mineral material having a softening point of less than 699.degree.C (1290.degree.F).
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