Flame resistant fabric for aviation airbags
A flame resistant fabric for the use in the construction of aviation airbags comprises a polyester fiber substrate which is treated with a first flame retardant. A polyurethane coating is applied to the polyester fiber substrate, which has been treated with the first flame retardant, to impart high pressure permeability resistance to the flame resistant fabric. The polyurethane coating comprises a second flame retardant to insure that the flame resistant fabric complies with Federal Aviation Requirement 25.853. The flame resistant fabric further comprises sufficient high pressure permeability resistance which is measured as a pressure of not less than about 198 kPa after five seconds from an initial inflation and pressurization to about 200 kPa, such as may be encountered in and during an inflation of aviation airbag assemblies.
1. A fabric for the construction of an airbag for installation in an aircraft, said fabric comprising:
a high tenacity continuous polyester filament yarn, said high tenacity continuous polyester filament yarn comprising:
a 500 denier-96 filament polyester fiber substrate; and
an amount of phosphate-phosphonate compound in a range of about 0.1%-0.3% by weight;
a plain weave utilizing said high tenacity continuous polyester filament yarn, characterized by a count of 49-53 per inch by 49-53 per inch, said plain weave having a first fabric side and a second fabric side, where said plain weave has been heat set to between 340 degrees Fahrenheit to 420 degrees Fahrenheit for a period of time of about 30 to 60 seconds; and
a composition comprising polyurethane with flame retardant additives, said composition applied as a coating to the first fabric side and the second fabric side at a coating weight of between 25-50 grams per square meter;
wherein said fabric, when subjected to aviation vertical flammability requirements, is characterized as: being self-extinguishing; having an average burn length not exceeding 8 inches; having an average flame time after removal of the flame source not exceeding 15 seconds; and having drippings that do not continue to flame for more than 5 seconds after falling; and is further characterized as exhibiting a high pressure permeability resistance characterized as a pressure of not less than 198 kPa after five seconds from an initial inflation and pressurization to 200 kPa.