Second gens are aluminium.
And to be correct, The 1st gens are'nt fiberglass, it's a compound created by SMC.
Here,
THERMOSETS, THERMOPLASTICS
ThermosetA polymer-based liquid or powder that becomes solid when heated, placed under pressure, treated with a chemical or via radiation. The curing process creates a chemical bond that, unlike a thermoplastic, prevents the material from being remelted. See thermoplastic, which was dismissed in recent years by some resin firms as a "mature" field with a recycling Achilles' heel, has outdistanced thermoplastic injection molded body panels by a wide margin. Ford Motor Co. has set the pace among the Big Three in its usage of thermoset body panels (PT, April '93, p. 70). Japanese transnationals have not embraced either species of plastic body panels, choosing to remain with steel.
Dimensional stability of body panels and the ability to meet E-coat paint temperatures are key advantages for thermoset resin systems. Current platforms with extensive utilization of thermoset body panels--such as hoods, roofs, liftgates, doors, bumper beams, and spoilers--include Ford's Mustang, Lincoln Mark
The Mark VIII was a large luxurious coupe from Lincoln, sold between 1993 and 1998. The Mark VIII was assembled at Ford's Wixom, Michigan assembly plant and was based on the FN10 platform.
..... Click the link for more information. and Windstar van; GM's Corvette, Camaro, Firebird and Cadillac DeVille; Chrysler's Viper and Neon; and various truck models and brands.
At the same time, injection and blow molded thermoplastics maintain a healthy pace in new applications for interior parts, as well as under-hood and fuel-system components. Nylon compounds and alloys continue to dominate the latter two areas, with "lost-core" molded engine manifolds developing as a high-growth application (PT, Feb. '94, p. 21).