The struggling plant has about 300 employees, down from more than 500 when it was bought by local investor Robert Price in 2008.
The company is not projecting a final day of production, but Zeledyne is not actively seeking more contracts for the facility, DiPietro said.
Zeledyne ceased glass production at the plant last year and laid off more than 200 people, but more than 300 workers were kept on to cut and finish glass.
The company also has a plant in Juarez, Mexico.
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