Out back in factories, maleic anhydride shows up again and again. Not loud, just there and slipping into mixtures where few would spot it. It starts with glue-like stuff, moves on to surface layers, and eventually shapes stiff plant-based plastics. Because it reacts so fast, it fits where most chemicals fall short. Never in the spotlight, though still doing work behind the scenes. Even when invisible, it leaves a mark. The importance of the Phthalic anhydride industry and maleic anhydride uses in industry is huge for many reasons.
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