The eight subheadings under 5603 are defined by two variables: fiber type (man-made filaments vs. other) and weight per square meter (≤25, 25–70, 70–150, and >150 g/m²). The weight thresholds correspond to functional differences — lighter grades are used in hygiene and medical applications, heavier grades in geotextiles and industrial filtration — and each subheading carries its own duty rate, so accurate weight measurement is essential for correct classification.

Yes — the heading explicitly covers nonwovens 'whether or not impregnated, coated, covered or laminated,' so coating or lamination alone does not move the product out of 5603. However, if the coating or lamination creates an article with its own specific heading (such as a waterproof garment or a coated technical textile with a dedicated provision), that more specific heading would take precedence.