Aircraft fabric covering often used in the restoration of older types that were originally covered using traditional methods. The purposes of the fabric covering of an aircraft are: Pioneering aviators such as George Cayley and Otto Lilienthal used cotton-covered flying surfaces for their manned glider designs. The Wright brothers also used cotton to cover their Wright Flyer. Other early aircraft used a variety of fabrics, silk and linen being commonly used. Some early aircraft, such as A.V. Roe's first machines, even used paper as a covering material. Until the development of cellulose based dope in 1911 a variety of methods of finishing the
Wrinkle-resistant fabric cellulose chains, while the second self-polymerize resins as well. N-methylol and DMDHEU are reagents commonly used for the treatments because of their relatively low costs; however, they produce free formaldehyde, which has been identified as a potential human carcinogen, and it can also cause harmful dermatological effects. The use of titanium dioxide (TiO) (as a catalyst/ co-catalyst for these reactions) has become an alternative way to minimize the formation of free formaldehyde and fabric strength loss. Dimethyloldihydroxyethyleneurea (DMDHEU) is the most commonly used durable-press finish. In this process, the chemical is first applied to the fabric. Then the fabric is