초록 ▼

A thermally insulative fire block sheet having an elastomeric layer is provided which has a surface flammability flame spread index of zero at 20 minutes of exposure in accordance with ASTM E-162 and which is capable, in a thickness of 1/16 inch, of blocking a flame of 1900°F. for more than an hour.

A thermally insulative fire block sheet having an elastomeric layer is provided which has a surface flammability flame spread index of zero at 20 minutes of exposure in accordance with ASTM E-162 and which is capable, in a thickness of 1/16 inch, of blocking a flame of 1900°F. for more than an hour. The sheet comprises at least two layers. One layer, facing the direction of the expected flame, is a silicone foam rubber comprising the reaction product of a vinylterminated polysiloxane containing －Si(CH3)2O－units and an organohydrogensiloxane polymer containing Si(H)(CH3)O－units. The silicone foam rubber also contains alumina trihydrate. The other layer is an adherent flame resistant support layer for said foam, preferably a glass cloth layer.

대표청구항 ▼

A fire block wrapper for electrical conducting cables comprising a thermally insulative fire block sheet including an elastomeric layer, said sheet having a surface flammability flame spread index of zero at 20 minutes of exposure in accordance with ASTM E-162 and which is capable, in a thickness of

A fire block wrapper for electrical conducting cables comprising a thermally insulative fire block sheet including an elastomeric layer, said sheet having a surface flammability flame spread index of zero at 20 minutes of exposure in accordance with ASTM E-162 and which is capable, in a thickness of 1/16 inch, of blocking a flame of 1900°F. for more than one hour, said sheet having a rectangular configuration with two side margins and two end margins; said fire block sheet comprising a flexible laminate of a support layer and said elastomeric layer, said elastomeric layer comprising a cured silicone foam rubber layer containing alumina trihydrate and being secured to one side surface of said support layer; said fire block wrapper further including a layer of thermal insulation material adjacent the other side surface of said support layer; fastening means secured to said wrapper and provided at one end margin on one surface of said laminate and at the other end margin on the opposite surface of said laminate; and said silicone foam rubber layer, said support layer, and said insulation material layer being flexible, whereby said wrapper can be wrapped around a conduit or the like and secured in place with said fastening means.