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A fire barrier system for use in aircraft, ship or offshore drilling platform comprises a flexible graphite sheet. Methods of providing fire barrier protection in an aircraft, ship or offshore drilling platform comprise installing the described fire barrier system in the aircraft, ship or offshore d

A fire barrier system for use in aircraft, ship or offshore drilling platform comprises a flexible graphite sheet. Methods of providing fire barrier protection in an aircraft, ship or offshore drilling platform comprise installing the described fire barrier system in the aircraft, ship or offshore drilling platform. Additionally, the fire barrier system when installed in the aircraft, ship or offshore drilling platform is described.

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1. A method of providing fire barrier protection in an aircraft comprising a) providing a fire barrier system for use in aircraft comprising a flexible graphite sheet, andb) installing the fire barrier system in the aircraft;wherein the flexible graphite sheet is a continuous film of graphite that h

1. A method of providing fire barrier protection in an aircraft comprising a) providing a fire barrier system for use in aircraft comprising a flexible graphite sheet, andb) installing the fire barrier system in the aircraft;wherein the flexible graphite sheet is a continuous film of graphite that has been prepared from a starting material polymer sheet that has been heated to a high temperature for a time sufficient to transform the polymer sheet into a flexible graphitized polymer sheet, and the flexible graphitized polymer sheet has a thermal conductivity in the plane direction of 300 W/mK or more and an Oxygen permeability and/or Hydrogen permeability of less than 5×101 cc/m2·day. 2. A method of providing fire barrier protection in a ship comprising a) providing a fire barrier system for use in a ship comprising a flexible graphite sheet, andb) installing the fire barrier system in the ship;wherein the flexible graphite sheet is a continuous film of graphite that has been prepared from a starting material polymer sheet that has been heated to a high temperature for a time sufficient to transform the polymer sheet into a flexible graphitized polymer sheet, and the flexible graphitized polymer sheet has a thermal conductivity in the plane direction of 300 W/mK or more more and an Oxygen permeability and/or Hydrogen permeability of less than 5×101 cc/m2·day. 3. A method of providing fire barrier protection in an offshore drilling platform comprising a) providing a fire barrier system for use in an offshore drilling platform comprising a flexible graphite sheet, and b) installing the fire barrier system in the offshore drilling platform;wherein the flexible graphite sheet is a continuous film of graphite that has been prepared from a starting material polymer sheet that has been heated to a high temperature for a time sufficient to transform the polymer sheet into a flexible graphitized polymer sheet, and the flexible graphitized polymer sheet has a thermal conductivity in the plane direction of 300 W/mK or more and an Oxygen permeability and/or Hydrogen permeability of less than 5×101 cc/m2·day. 4. The method of claim 1, the system comprising a laminate for enclosing an insulation bag, the laminate comprising as one of the layers the flexible graphitized polymer sheet. 5. The method of claim 1, the system comprising an insulation blanket comprising as one layer of the insulation blanket the flexible graphitized polymer sheet. 6. The method of claim 1, wherein the amount of carbon monoxide gas generated from the flexible graphitized polymer sheet thus prepared is under 5.0 E+16 molecules CO/mg of graphite sheet when measured by 3D-MASS. 7. The method of claim 1, wherein the flexible graphitized polymer sheet has an emissivity of 0.45 or less. 8. A method of providing fire barrier protection in an aircraft comprising a) providing a fire barrier system for use in aircraft comprising a flexible graphite sheet, andb) installing the fire barrier system in the aircraft; wherein the flexible graphite sheet has been prepared from a starting material polymer sheet that has been heated to a high temperature for a time sufficient to transform the polymer sheet into a flexible graphitized polymer sheet, and the flexible graphitized polymer sheet has a thermal conductivity in the plane direction of 300 W/mK or more; and wherein the flexible graphitized polymer sheet has: a thermal conductivity in the thickness direction of 1 to 20 W/mK; andthe ratio of the thermal conductivity in the plane direction to the thermal conductivity in the thickness direction of 20 or more. 9. The method of claim 1, wherein the flexible graphitized polymer sheet exhibits in a picture frame test a heat flux of 3.4 W/cm2 (3.0 BTU/ft2·s) or less 6 minutes after start of the test and a temperature of 300° C. (527 F) or less 6 minutes after start of the test in a picture frame test. 10. The method of claim 1, wherein the flexible graphitized polymer sheet exhibits a heat flux of 3.4 W/cm2 (3.0 BTU/ft2·s) or less 6 minutes after start of the test in a picture frame test in a burn-through test. 11. The method of claim 1, wherein the flexible graphitized polymer sheet exhibits a heat flux of 8.0 W/cm2 or less at the rear side of the graphitized polymer sheet 6 minutes after start of the test in a picture frame test. 12. The method of claim 1, wherein the flexible graphitized polymer sheet exhibits a temperature of 800° C. or less at the rear side of the graphitized polymer sheet 6 minutes after start of the test in a picture frame test. 13. The method of claim 1, wherein The MIT Folding Endurance of the flexible graphitized polymer sheet is 1000 times or more. 14. The method of claim 1, wherein the water absorption of the flexible graphitized polymer sheet is 1% or less. 15. The method of claim 1, wherein the gas permeability of the flexible graphitized polymer sheet is 100.0×106 cc/m2·day or less. 16. The method of claim 1, wherein the flexible graphitized polymer sheet has a weight of from about 20 to about 250 g/m2. 17. The method of claim 1, wherein the electrical conductivity of the flexible graphitized polymer sheet is 10000 S/cm or more. 18. The method of claim 1, wherein the flexible graphitized polymer sheet is adhered to a substrate or system component with a flame-retardant adhesive material. 19. A fire barrier system installed in an aircraft comprising a the flexible graphitized polymer sheet installed by the method of claim 1. 20. A fire barrier system installed in a ship comprising the flexible graphitized polymer sheet installed by the method of claim 2. 21. A fire barrier system installed in an offshore drilling platform comprising the flexible graphitized polymer sheet installed by the method of claim 3. 22. The method of claim 1, wherein the flexible graphitized polymer sheet has a thermal conductivity in the plane direction of 1000 W/mK or more. 23. The method of claim 1, wherein the flexible graphite sheet has been prepared from a starting material polyimide sheet that has been heated to a high temperature for a time sufficient to transform the polyimide sheet into a flexible graphitized polyimide sheet.