5210.31.40 - Of number 42 or lower number

This HTS classification covers dyed woven fabrics of cotton, specifically those containing less than 85 percent by weight of cotton and mixed mainly or solely with man-made fibers. The critical defining characteristic for this particular subcategory is that the yarn used in the fabric is of "number 42 or lower number." The "number" of yarn refers to its fineness, with lower numbers indicating coarser yarns. Therefore, this classification is for fabrics constructed with relatively thick cotton-based yarns when blended with man-made fibers, weighing not more than 200 g/m², and which have been dyed.

This category is distinguished from its siblings by the yarn count. Whereas 5210.31.60 covers fabrics made with yarns of numbers 43 to 68, and 5210.31.80 encompasses fabrics with yarns of number 69 or higher (finer yarns), this specific category, 5210.31.40, is exclusively for fabrics utilizing coarser yarns (number 42 or lower). All these categories fall under the broader umbrella of dyed, plain weave cotton-blend fabrics weighing up to 200 g/m², but the distinction in yarn thickness is the key differentiator at this level.

Within this classification, further subdivisions are made based on the specific weave construction and application of the fabric. The subcategories, such as poplin or broadcloth, sheeting, and cheesecloth, provide more granular definitions. These distinctions are important for accurately identifying the intended use and specific weave pattern of the fabric, reflecting common textile terminology and industry standards that inform customs valuation and duty assessment.