PITTSBURGH–(BUSINESS WIRE)–PPG (NYSE: PPG) today announced a $70 million investment to expand its aerospace transparencies site in Huntsville, Alabama. The investment is part of a series of multi-year projects that support the company’s ongoing efforts to increase production capacity and continued growth of PPG’s aerospace transparencies business. “Demand for aerospace transparencies continues to grow across commercial, military and general aviation markets,” said Francois Buehlmann, PPG gene