Many advanced composite materials use hazardous chemicals in the adhesive resin and use inorganic fibers for strength.
A typical composite like fiberglass might use a styrene-polyester co-polymer, a polyurethane, or an epoxy resin. While the cured resin is unreactive, the uncured form may be quite toxic, posing risk during manufacturing.
Furthermore, the resources used to make traditional composites are non-renewable: petroleum, natural gas, and minerals.
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