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Polyurethane
Urethane is known as a common material in the mass-production of aero-parts. The method used for manufacturing polyurethane differs completely from the method used to manufacture FRP. When manufacturing polyurethane aero-parts, two liquid resins are mixed together, and a press is used to harden the material. There are varying degrees of strength when referring to polyurethane, and the type used to manufacture aero-parts is similar in strength to polypropylene, and is known to be very flexible, and hard to crack.
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