fiber formed of linear macromolecules having in the chain recurring amide groups, at least 85% of them are joined to aliphatic or cykloalifatickýrn units
aramid
fiber consisting of linear macromolecules made up of aromatic groups joined by amide or imide linkages, of which 85% is connected directly to two aromatic cycles, as the number of imide linkages, not exceeding the number of amide linkages