The insulated glass products manufacturing company was founded in Germany in 1971. It opened operations in Wisconsin in 1986. In 1993, it moved its U.S. headquarters from Wisconsin to North Carolina.
A spokeswoman at the Deerfield plant, 201 Interpane Lane, said there was no exact timetable for the closing but said it was expected in the coming months. State law requires companies to file notice of plant closings at least 60 days in advance.