Koppers Holding closing plant; nearly 50 left jobless

GRENADA — Koppers Holdings Inc., which produces carbon compounds and wood treatment products, says it will close a facility in Grenada because of low levels of profitability that show no signs of future improvement.

Pittsburgh-based Koppers said in a news release that the wood treating plant in Grenada, which employed about 46 people, shut down by July 31.

According to the news release, the plant produces utility poles and had net sales in 2011 of about $30 million.

Koppers said the estimated cost of closing the Grenada facility is about $4 million.