Para-aramid, known as poly-terephthaloyl-p-phenylenediamine, or PPTA, is a kind of aromatic polyamide fiber. Also known as Aramid-II or Aramid 1414 in China, it is a linear macromolecule composed of amide groups connected to each other and to the para-phenyl ring, where at least 85% of the amide bond is directly connected between the two para-phenyl rings.
A new type of high-tech synthetic fiber, with ultra-high strength, high modulus and high temperature, acid and alkali resistance, lightweight, and other excellent properties, its specific strength is 5 to 6 times that of steel wire, its modulus is 2 to 3 times that of steel wire or glass fibers, its toughness is 2 times that of steel wire, while the weight is only about 1/5 of the steel wire, with good insulation and aging resistance.
Para-aramid has excellent cut resistance, heat resistance, abrasion resistance, insulation, and dimensional stability, which has an irreplaceable role in the fields of defense and military industry, aerospace, transportation, information, and new energy, etc., and can be made into optical fiber cables, protective clothing, bullet-proof helmets, brake pads, sealing gaskets, hoses, tires, safety ropes, and other products.