Japanese glass maker Hoya Corp. plans to resume suspended shipments of glass slabs to the U.S. Energy Department's nuclear weapons research facility, believing the product will not lead to new nuclear development, the company said.

"It was confirmed that this glass itself will not lead to new nuclear development, and the research programs are to contribute to the elimination of nuclear weapons," the company said Monday in a letter to antinuclear groups.

The company last month temporarily suspended deliveries of the slabs by its U.S. subsidiary Hoya Corp. U.S.A. in the wake of domestic opposition claiming the deal will help the United States keep its nuclear weapons.