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But there is a material is acrylic, viscose fibers or pitch fibers by needling felting, felting through carbon oxidation and carbonization treatment after treatment after made ??of graphite, the high temperature up to 3000 ℃. The thermal expansion coefficient of less than (2 ~ 5) * 10-6 / ℃, three times the strength of aluminum alloy, steel weight is only 1/5. This material is used in aerospace, spacecraft, rocket nose cone, the aircraft tail-pipe inside the protective layer and large-scale integrated

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