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The rear bumper cover, where lights and plate are mounted, is made of a flexible material just like most cars. The metal bumper is behind this cover, same for the front of car.
"C7’s use of materials includes a standard carbon-fiber hood and roof panel, supplied by Plasan Carbon Composites’ new Walker, MI, plant. Plasan has innovative manufacturing processes that shatter previous autoclave-type processing times, getting per-part processing down to 17-min machine cycles. For more detail, read this AEI article.
The unique balsa-wood-sandwich floor construction of the C6 Corvette has been superseded on C7 by a new carbon nano-composite floor pan that is lighter while maintaining strength and stiffness, said Chief Engineer Tadge Juechter.
C7’s front fenders, doors, rear quarter panels, and the rear hatch panel are made with lighter-density sheet molding compound (SMC) than the previous generation. The door outer panel measures 1.2 mm (0.047 in) thick and the inner panel 0.8 mm (0.031 in). Combined, the body materials and their design/engineering save approximately 37 lb (17 kg) vs. the C6 body structure."
"When people need a material that’s strong yet lightweight, they usually look to carbon fiber. In the near future, however, they may instead choose to go with composite materials made from stretched carbon nanotubes. These materials could theoretically offer the same strength as carbon fiber at one-tenth the weight, or the same weight at ten times the strength. Researchers from North Carolina State University have recently succeeded in creating such a composite."