organic colouring matter, whether or not chemically defined; preparations as specified in note to this chapter based on synthetic organic colouring matter; synthetic organic products of a kind used as fluorescent brightening agents or as lumin ₹ ₹ ₹ ₹ yarn (other than sewing thread) of syntheticstaple...
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aromatic rings. molecular structure made of linked benzene rings and amide bonds. fibre structure: the molecules form a planar array with weak interchain hydrogen bonding easily fibrillated up on the fracture. radially arranged axially pleated crystalline supramolecular sheets. hydrogen bonding aramid fibres...