Projects to be built at the PRC in recent years were planned to include a 100,000 t/y
petroleum tar plant and a 50,000 t/y plant for special waxes.
Warren replaced costly pine pitch with coal tar and later found a natural asphalt that could be combined with
petroleum tar to produce a roofing pitch, according to From Asbestos to Zinc: Roofing for Historic Buildings, a report from the Technical Services Branch of the National Park Service.
He ultimately used a thin film of
petroleum tar coated on a pewter plate as a recording medium.
During the week of December 16 to 20, the European Commission will be presenting its proposals for stepping up the elimination of single-hull vessels aged 15 years and over and for banning the transport to or from EU ports of heavy fuel oil,
petroleum tar and bitumens in single-hulled vessels.
Projects to be built at the PRC by 2001 include a 100,000 t/y
petroleum tar plant and a 50,000 t/y plant for special waxes.