DuPont paper, also known as Nome paper, is an environmentally friendly non-woven fabric produced by DuPont, also known as Tyvek or Tyvek. In wooden structure buildings, it is often used as waterproofing material for exterior walls and roofs. Because of its one-way breathability, it is also called "breathing paper". It is a high-density polyethylene that uses flash evaporation technology to process the polymer into continuous filaments after being hot-melted and then thermally bonded. This unique process technology can produce lightweight yet very tough polyethylene. Material. DuPont paper products combine the advantages of paper, film and fiber into one, which is tough and durable and has strong tear resistance. TYVEK is the trademark of a packaging material produced by DuPont, which is translated into "Tyvek" in China. 1073B, 1059B, and 2FS are three types of this material, used for medical purposes. The three have different indicators in terms of material density, tensile strength, thickness, etc.