5509.69.20.00 - Single yarn (607)

This HTS classification, 5509.69.20.00, specifically covers single yarn that is not put up for retail sale and is made from synthetic staple fibers. The defining characteristic here is that the yarn is composed *only* of acrylic or modacrylic staple fibers, without any significant blending with other synthetic staple fibers. Furthermore, this yarn must be a "single" construction, meaning it has not been twisted with other yarns to form a multiple or cabled yarn. The "607" designation in the description likely refers to a specific Customs Ruling or note that provides further clarification or examples pertinent to this yarn's construction or intended use, though it is not explicitly detailed in the provided context.

It is crucial to distinguish this category from its sibling, 5509.69.40.00, which covers multiple (folded) or cabled yarn. While both categories fall under "Other yarn, of acrylic or modacrylic staple fibers: Mixed mainly or solely with artificial staple fibers," the key differentiator is the yarn construction. This category is for individual, untwisted yarns, whereas the sibling is for yarns that have undergone a twisting process to create a more robust or specialized thread.

As a leaf node, this classification does not have further subdivisions. Therefore, the focus for classification within 5509.69.20.00 relies heavily on ensuring the yarn meets the criteria of being a single yarn composed exclusively of acrylic or modacrylic staple fibers and is not presented for direct sale to consumers. The context provided by the "607" note should be consulted to ensure all specific technical requirements for this particular yarn are met, as it may indicate specific deniers, twist levels (within the single yarn definition), or other physical properties that are critical for accurate classification.