tar

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Research detailed in a recent article in the journal Environmental Science & Technology, has found that Sealcoat made from a refined coal-tar pitch emulsion has about one thousand times more polycyclic aromatic hydrocarbons (PAHs) than regular asphalt emulsion.
1995, Carbonization of coal-tar pitch dehydrogenated by sulphur, Ceramics-Silikaty, 39 (3), 19-104.
chose that route when it came time to replace the leaking coal-tar pitch built-up roof on its distribution center in Newnan, GA.