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Fabrics and yarns that make up the back of the carpet as opposed to the carpet pile or face. In tufted carpet: Primary backing - A woven or nonwoven fabric in which the yarn is inserted by the tufting needles. Secondary backing - Fabric laminated to the back of the carpet to reinforce and increase dimensional stability. In woven carpet, the backing is the "construction yarns" which are interwoven with the face yarn.