noun
a type of synthetic resin made from the polymerization of formaldehyde and another compound, often used in the production of various plastic products
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The manufacturer decided to use acetal resin for its durability and chemical resistance.
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I heard they're making the new parts out of that acetal resin stuff.
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This acetal resin is top-notch, it won't break no matter what.
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Her heart was like an acetal resin, strong and unbreakable.