DuPont executives will announce plans today to expand their Berkeley County chemical plant.

Spokesman Terry Gooding confirmed that officials from the Delaware-based chemical and synthetic textiles maker will be attending an economic development announcement being held at the Berkeley County Government Offices in Moncks Corner. He declined to provide any details about the expansion, including the number of jobs and why the plant is expanding.

In a press release, the state Commerce Department said the announcement would be "significant" but did not provide other details.

In November, DuPont officials quietly submitted expansion plans to the state Department of Health and Environmental Control. The renderings show new buildings, storage structures and a rail spur.

Site manager Ellis McGaughy later told The Post and Courier that the Bushy Park plant was one of several locations being considered for expansion. The company applied for the permit to keep the local facility on par with the other competing properties, he added.

The project site totals slightly more than 74 acres.

The expansion plans show four buildings, two tank farms, a rail line and a reconfiguration of the existing road network. It also outlines six other buildings that are labeled as "future expansion."

The Bushy Park plant, near the west branch of the Cooper River, now makes a soft, flexible plastic called Hytrel.

Gooding also declined to say whether new workers at the Berkeley County operation will make Kevlar, a strong synthetic fiber best known for its use in bullet-resistent vests and military body armor.

In September, the company announced it would invest $500 million by 2010 to increase production of Kevlar by more than 25 percent. The announcement marked the largest Kevlar expansion since the fiber was introduced in 1965, DuPont said.