The invention refers to a fiber structure, which is composed of multiple carbon polymer fibers, which are basically irreversible, non-linear and non flammable pyrolytic fibers, wherein the first fiber is elastic, formal and elongated, and has the proportion of reversible reduction. More than 1.2:1, appearance ratio more than 10:1, and at least a second carbon polymer fiber, which is basically hot formed in a non combustible and non combustible way, or these characteristic threads, are implanted in the gap with the first batch of fibers to form a closed fiber structure.
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