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BCF polypropylene filament is a very common carpet yarn. Polypropylene fiber can also be called polypropylene fiber. Polypropylene fiber is not like other types of carpet fibers. Polypropylene itself is non-absorbent and has low dyeing performance. Therefore, during the dyeing process of the raw silk, the color has actually been built up, which becomes a part of the carpet. Even if exposed to strong sunlight, bleach, air pollution or other harmful substances, it will not fade.