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GFRP is not "fiberglass". Nobody in the composites industry would ever say that it was, in the sense that you are intending. It's more complex than that. Just because you personally might not be not familiar with the difference, doesn't mean that it isn't significantly different.However you want to describe it, the panels are "plastic" or resin, that is reinforced with....wait for it....glass fibre. Hence........fibreglass. It is a different process than the old hand layup method, but it is still basically fibreglass.
A "fiberglass" as used in the automotive industry for 75+ years (and pioneered by Lotus!) is a fundamentally textile or matted material, built up in layers over a rigid form, with a resin material applied that wicks into the fiber mat and then is cured to harden the combined material into a solid. The combined composite material cannot be injection molded because it is never liquid. After curing, the piece changes size and shape slightly and usually must be trimmed and hand-finished to reach its final dimensional form and detail, particularly at the edges. It is a porous, heterogenous composite material with reasonably high tensile strength but a low degree of consistency in strength and behaviors - typically fiberglass panels are somewhat brittle and do not handle impacts well unless reinforced or built to be very thick.
A GFRP (or AFRP, or CFRP) is a fundamentally plastic material that can be injection-molded in liquid form, and has a very specific ratio of suspended free fiber mixed into the plastic in a way that keeps the fibers evenly suspended throughout the mix. It is a non-porous, homogenous composite material with a high degree of consistency in strength and behaviors. Panels made from this material are typically both strong and "tough"... meaning non-brittle. They usually handle impacts and temperature changes very well. They are NOT a fiberglass in the sense intended by most in the automotive industry.
FYI in the construction industry these terms are mixed more closely. That's a thing within that industry's colloquial understanding of the terms. Different context.
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