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Large-Scale Outdoor Fire-Released Carbon Fiber Tests

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Final rept. Jul 79-Jan 80

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Five large-scale outdoor pool fire tests three sourcedissemination and two source resulted in obtaining characteristic data of carbon fibers released into the atmosphere when carbon fiberepoxy matrix composite structural components were exposed to large-scale outdoor jet-fuel fires representative of fires expected to be experienced in civil aircraft accidents. Estimated source strength release of carbon fibers varied from 1.1 x ten to the 8th power to 2.9 x ten to the 8th power single fibers released under burn conditions of moderate to high wind speeds required in the sourcedissemination tests. Estimated source strength data for these trials was derived from fibers captured on a vertical mesh sampler array designed to intercept the fire plume downwind of the source. Estimated single fiber source strengths, derived from the two source burn tests which required wind speeds to be near zero, varied from 2.2 x ten to the 8th power to 2.9 x ten to the 8th power. The fiber data for these tests was obtained by a passive sampler designed to capture fibers contained in the fire plume and rising from the fire. Good correlation of source strength estimates was obtained by the two fiber sampling methods. The mean length of fibers collected on the stainless steel mesh samplers on the vertical array was 4.8 mm while the mean length of fibers collected on the overhead Peterson and DPG stainless steel mesh samplers attached to the overhead canopy array was 3.0 mm.

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  • Textiles

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