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Styrofoam is a mass noun, it is already plural.

It is most often encountered as an adjective - i.e. a Styrofoam mug, a Styrofoam container ... and these do not have a plural just as there is no plural for "big" in 10 big mugs or 20 big containers, we just say 10 Styrofoam mugs, 20 Styrofoam containers.

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14y ago

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